We know what the "similitude" of the sun and the moon were like among the surrounding nations. We see their "hieroglyphs" on numberless seals and images from the ruins of Nineveh or Babylon. That of the sun was first a rayed star or disc, later a figure, rayed and winged. That of the moon was a crescent, one lying on its back, like a bowl or cup, the actual attitude of the new moon at the beginning of the new year. Just such moon similitudes did the soldiers of Gideon take from off the camels of Zebah and Zalmunna; just such were the "round tires like the moon" that Isaiah condemns among the bravery of the daughters of Zion.

The similitude or token of Ashtoreth, the paramount goddess of the Zidonians, was the ashera, the "grove" of the Authorized Version, probably in most cases merely a wooden pillar. This goddess, "the abomination of the Zidonians," was a moon-goddess, concerning whom Eusebius preserves a statement by the Phœnician historian, Sanchoniathon, that her images had the head of an ox. In the wars in the days of Abraham we find Chedorlaomer, and the kings that were with him, smiting the Rephaim in Ashteroth Karnaim, that is, in the Ashtoreths "of the horns." It is impossible to decide at this date whether the horns which gave the distinctive title to this shrine of Ashtoreth owed their origin to the horns of the animal merged in the goddess, or to the horns of the crescent moon, with which she was to some extent identified. Possibly there was always a confusion between the two in the minds of her worshippers. The cult of Ashtoreth was spread not only among the Hebrews, but throughout the whole plain of Mesopotamia. In the times of the Judges, and in the days of Samuel, we find continually the statement that the people "served Baalim and Ashtaroth"—the plurals of Baal and Ashtoreth—these representing the sun and moon, and reigning as king and queen in heaven. When the Philistines fought with Saul at Mount Gilboa, and he was slain, they stripped off his armour and put it "in the house of Ashtaroth." Yet later we find that Solomon loved strange women of the Zidonians, who turned his heart after Ashtoreth, the goddess of the Zidonians, and he built a high place for her on the right hand of the Mount of Olives, which remained for some three and a half centuries, until Josiah, the king, defiled it. Nevertheless, the worship of Ashtoreth continued, and the prophet Jeremiah describes her cult:—

This was done in the cities of Judah and streets of Jerusalem, but the Jews carried the cult with them even when they fled into Egypt, and whilst there they answered Jeremiah—

Ashtoreth, according to Pinches[90:1] is evidently a lengthening of the name of the Assyrio-Babylonian goddess Ištar, and the Babylonian legend of the Descent of Ištar may well have been a myth founded on the varying phases of the moon. But it must be remembered that, though Ashtoreth or Ištar might be the queen of heaven, the moon was not necessarily the only aspect in which her worshippers recognized her. In others, the planet Venus may have been chosen as her representative; in others the constellation Taurus, at one time the leader of the Zodiac; in others, yet again, the actual form of a material bull or cow.

The Hebrews recognized the great superiority in brightness of the sun over the moon, as testified in their names of the "greater" and "lesser" lights, and in such passages as that already quoted from Isaiah (xxx. 26). The word here used for moon is the poetic one, lebanah. Of course no argument can be founded on the parallelism employed so as to lead to the conclusion that the Hebrews considered that the solar light exceeded the lunar by only seven times, instead of the 600,000 times indicated by modern photometric measurement.

In only one instance in Scripture—that already quoted of the moon withdrawing itself—is there even an allusion to the changing phases of the moon, other than that implied in the frequent references to the new moons. The appointment of certain feasts to be held on the fifteenth day of the month is a confirmation of the supposition that their months were truly lunar, for then the moon is fully lighted, and rides the sky the whole night long from sunset to sunrise. It is clear, therefore, that the Hebrews, not only noticed the phases of the moon, but made regular use of them. Yet, if we adopted the argument from silence, we should suppose that they had never observed its changes of shape, for there is no direct allusion to them in Scripture. We cannot, therefore, argue from silence as to whether or no they had divined the cause of those changes, namely that the moon shines by reflecting the light of the sun.

Nor are there any references to the markings on the moon. It is quite obvious to the naked eye that there are grey stains upon her silver surface, that these grey stains are always there, most of them forming a chain which curves through the upper hemisphere. Of the bright parts of the moon, some shine out with greater lustre than others, particularly one spot in the lower left-hand quadrant, not far from the edge of the full disc. The edges of the moon gleam more brightly as a rule than the central parts. All this was apparent to the Hebrews of old, as it is to our unassisted sight to-day.

The moon's influence in raising the tides is naturally not mentioned. The Hebrews were not a seafaring race, nor are the tides on the coast of Palestine pronounced enough to draw much attention. One influence is ascribed to the moon; an influence still obscure, or even disputed. For the promise that—

quite obvious in its application to the sun, with the moon seems to refer to its supposed influence on certain diseases and in causing "moon-blindness."

The chief function of the moon, as indicated in Scripture, is to regulate the calendar, and mark out the times for the days of solemnity. In the words of the 104th Psalm:—

FOOTNOTES:

CHAPTER VIII

THE STARS

The stars and the heaven, whose host they are, were used by the Hebrew writers to express the superlatives of number, of height, and of expanse. To an observer, watching the heavens at any particular time and place, not more than some two thousand stars are separately visible to the unassisted sight. But it was evident to the Hebrew, as it is to any one to-day, that the stars separately visible do not by any means make up their whole number. On clear nights the whole vault of heaven seems covered with a tapestry or curtain the pattern of which is formed of patches of various intensities of light, and sprinkled upon this patterned curtain are the brighter stars that may be separately seen. The most striking feature in the pattern is the Milky Way, and it may be easily discerned that its texture is made up of innumerable minute points of light, a granulation, of which some of the grains are set more closely together, forming the more brilliant patches, and some more loosely, giving the darker shades. The mind easily conceives that the minute points of light whose aggregations make up the varying pattern of the Milky Way, though too small to be individually seen, are also stars, differing perhaps from the stars of the Pleiades or the Bears only in their greater distance or smaller size. It was of all these that the Lord said to Abram—

The first catalogue of the stars of which we have record was that of Hipparchus in 129 b.c. It contained 1,025 stars, and Ptolemy brought this catalogue up to date in the Almagest of 137 a.d. Tycho Brahé in 1602 made a catalogue of 777 stars, and Kepler republished this in 1627, and increased the number to 1,005. These were before the invention of the telescope, and consequently contained only naked-eye stars. Since astronomers have been able to sound the heavens more deeply, catalogues have increased in size and number. Flamsteed, the first Astronomer Royal, made one of 3,310 stars; from the observations of Bradley, the third, a yet more famous catalogue has been compiled. In our own day more than three hundred thousand stars have been catalogued in the Bonn Durchmusterung; and the great International Photographic Chart of the Heavens will probably show not less than fifty millions of stars, and in this it has limited itself to stars exceeding the fourteenth magnitude in brightness, thus leaving out of its pages many millions of stars that are visible through our more powerful telescopes.

So when Abraham, Moses, Job or Jeremiah speaks of the host of heaven that cannot be numbered, it does not mean simply that these men had but small powers of numeration. To us,—who can count beyond that which we can conceive,—as to the Psalmist, it is a sign of infinite power, wisdom and knowledge that "He telleth the number of the stars; He calleth them all by their names."

Isaiah describes the Lord as "He that sitteth upon the circle of the earth, . . . that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in." And many others of the prophets use the same simile of a curtain which we have seen to be so appropriate to the appearance of the starry sky. Nowhere, however, have we any indication whether or not they considered the stars were all set on this curtain, that is to say were all at the same distance from us. We now know that they are not equidistant from us, but this we largely base on the fact that the stars are of very different orders of brightness, and we judge that, on an average, the fainter a star appears, the further is it distant from us. To the Hebrews, as to us, it was evident that the stars differ in magnitude, and the writer of the Epistle to the Corinthians expressed this when he wrote—

The ancient Greek astronomers divided the stars according to their brightness into six classes, or six "magnitudes," to use the modern technical term. The average star of any particular magnitude gives about two and a half times as much light as the average star of the next magnitude. More exactly, the average first magnitude star gives one hundred times the light of the average star of the sixth magnitude.

In a few instances we have been able to measure, in the very roughest degree, the distances of stars; not a hundred stars have their parallaxes known, and these have all been measured in the course of the last century. And so far away are these stars, even the nearest of them, that we do not express their distance from us in millions of miles; we express it in the time that their light takes in travelling from them to us. Now it takes light only one second to traverse 186,300 miles, and yet it requires four and a third years for the light from the nearest star to reach us. This is a star of the first magnitude, Alpha in the constellation of the Centaur. The next nearest star is a faint one of between the seventh and eighth magnitudes, and its light takes seven years to come. From a sixth magnitude star in the constellation of the Swan, the light requires eight years; and from Sirius, the brightest star in the heavens, light requires eight and a half years. These four stars are the nearest to us; from no other star, that we know of, does light take less than ten years to travel; from the majority of those whose distance we have succeeded in measuring, the light takes at least twenty years.

To get some conception of what a "light-year" means, let us remember that light could travel right round the earth at its equator seven times in the space of a single second, and that there are 31,556,925 seconds in a year. Light then could girdle the earth a thousand million times whilst it comes from Alpha Centauri. Or we may put it another way. The distance from Alpha Centauri exceeds the equator of the earth by as much as this exceeds an inch and a half; or by as much as the distance from London to Manchester exceeds the hundredth of an inch.

Of all the rest of the innumerable stars, as far as actual measurement is concerned, for us, as for the Hebrews, they might all actually lie on the texture of a curtain, at practically the same distance from us.

We have measured the distances of but a very few stars; the rest—as every one of them was for the Hebrew—are at a greater distance than any effort of ours can reach, be our telescopes ever so great and powerful, our measuring instruments ever so precise and delicate. For them, as for us, the heaven of stars is "for height," for a height which is beyond measure and therefore the only fitting image for the immensity of God.

So Zophar the Naamathite said—

and Eliphaz the Temanite reiterated still more strongly—

God Himself is represented as using the expanse of heaven as a measure of the greatness of his fidelity and mercy. The prophet Jeremiah writes—

As if he were using the figure of a great cross, whose height was that of the heavens, whose arms stretched from east to west, David testifies of the same mercy and forgiveness:—

CHAPTER IX

COMETS

Great comets are almost always unexpected visitors. There is only one great comet that we know has been seen more than once, and expect with reasonable certainty to see again. This is Halley's comet, which has been returning to a near approach to the sun at somewhat irregular intervals of seventy-five to seventy-eight years during the last centuries: indeed, it is possible that it was this comet that was coincident with the invasion of England by William the Conqueror.

There are other small comets that are also regular inhabitants of the solar system; but, as with Halley's comet, so with these, two circumstances are to be borne in mind. First, that each successive revolution round the sun involves an increasing degradation of their brightness, since there is a manifest waste of their material at each near approach to the sun; until at length the comet is seen no more, not because it has left the warm precincts of the sun for the outer darkness, but because it has spent its substance. Halley's comet was not as brilliant or as impressive in 1835 as it was in 1759: in 1910 it may have become degraded to an appearance of quite the second order.

Next, we have no knowledge, no evidence, that any of these comets have always been members of the solar family. Some of them, indeed, we know were adopted into it by the influence of one or other of the greater planets: Uranus we know is responsible for the introduction of one, Jupiter of a considerable number. The vast majority of comets, great or small, seem to blunder into the solar system anyhow, anywhere, from any direction: they come within the attractive influence of the sun; obey his laws whilst within that influence; make one close approach to him, passing rapidly across our sky; and then depart in an orbit which will never bring them to his neighbourhood again. Some chance of direction, some compelling influence of a planet that it may have approached, so modified the path of Halley's comet when it first entered the solar system, that it has remained a member ever since, and may so remain until it has ceased to be a comet at all.

It follows, therefore, that, as to the number of great comets that may be seen in any age, we can scarcely even apply the laws of probability. During the last couple of thousand years, since chronicles have been abundant, we know that many great comets have been seen. We may suppose, therefore, that during the preceding age, that in which the Scriptures were written, there were also many great comets seen, but we do not know. And most emphatically we are not able to say, from our knowledge of comets themselves and of their motions, that in the days of this or that writer a comet was flaming in the sky.

If a comet had been observed in those ages we might not recognize the description of it. Thus in the fourth year of the 101st Olympiad, the Greeks were startled by a celestial portent. They did not draw fine distinctions, and posterity might have remained ignorant that the terrifying object was possibly a comet, had not Aristotle, who saw it as a boy at Stagira, left a rather more scientifically worded description of it. It flared up from the sunset sky with a narrow definite tail running "like a road through the constellations." In recent times the great comet of 1843 may be mentioned as having exactly such an appearance.

So we cannot expect to find in the Scriptures definite and precise descriptions that we can recognize as those of comets. At the most we may find some expressions, some descriptions, that to us may seem appropriate to the forms and appearances of these objects, and we may therefore infer that the appearance of a comet may have suggested these descriptions or expressions.

The head of a great comet is brilliant, sometimes starlike. But its tail often takes on the most impressive appearance. Donati's comet, in 1858, assumed the most varied shapes—sometimes its tail was broad, with one bright and curving edge, the other fainter and finer, the whole making up a stupendous semi-circular blade-like object. Later, the tail was shaped like a scimitar, and later again, it assumed a duplex form.

Though the bulk of comets is huge, they contain extraordinarily little substance. Their heads must contain some solid matter, but it is probably in the form of a loose aggregation of stones enveloped in vaporous material. There is some reason to suppose that comets are apt to shed some of these stones as they travel along their paths, for the orbits of the meteors that cause some of our greatest "star showers" are coincident with the paths of comets that have been observed.

But it is not only by shedding its loose stones that a comet diminishes its bulk; it loses also through its tail. As the comet gets close to the sun its head becomes heated, and throws off concentric envelopes, much of which consists of matter in an extremely fine state of division. Now it has been shown that the radiations of the sun have the power of repelling matter, whilst the sun itself attracts by its gravitational force. But there is a difference in the action of the two forces. The light-pressure varies with the surface of the particle upon which it is exercised; the gravitational attraction varies with the mass or volume. If we consider the behaviour of very small particles, it follows that the attraction due to gravitation (depending on the volume of the particle) will diminish more rapidly than the repulsion due to light-pressure (depending on the surface of the particle), as we decrease continually the size of the particle, since its volume diminishes more rapidly than its surface. A limit therefore will be reached below which the repulsion will become greater than the attraction. Thus for particles less than the 1/25000 part of an inch in diameter the repulsion of the sun is greater than its attraction. Particles in the outer envelope of the comet below this size will be driven away in a continuous stream, and will form that thin, luminous fog which we see as the comet's tail.

We cannot tell whether such objects as these were present to the mind of Joel when he spoke of "blood and fire and pillars of smoke"; possibly these metaphors are better explained by a sand- or thunder-storm, especially when we consider that the Hebrew expression for the "pillars of smoke" indicates a resemblance to a palm-tree, as in the spreading out of the head of a sand- or thunder-cloud in the sky. The suggestion has been made,—following the closing lines of Paradise Lost (for Milton is responsible for many of our interpretations of Scripture)

—that a comet was indeed the "flaming sword which turned every way, to keep the way of the tree of life." There is less improbability in the suggestion made by several writers that, when the pestilence wasted Jerusalem, and David offered up the sacrifice of intercession in the threshing floor of Ornan the Jebusite, the king may have seen, in the scimitar-like tail of a comet such as Donati's, God's "minister,"—"a flame of fire,"—"the angel of the Lord stand between the earth and the heaven, having a drawn sword in his hand stretched out over Jerusalem."

The late R. A. Proctor describes the wanderings of a comet thus:—

FOOTNOTES:

CHAPTER X

METEORS

Great meteorites—"aerolites" as they are called—are like great comets, chance visitors to our world. Now and then they come, but we cannot foretell their coming. Such an aerolite exploded some fifteen miles above Madrid at about 9^h 29^m, on the morning of February 10, 1896:—

Many fragments were picked up, and analyzed, and, like other aerolites, were found to consist of materials already known on the earth. The outer crust showed the signs of fire,—the meteoric stone had been fused and ignited by its very rapid rush through the air—but the interior was entirely unaffected by the heat. The manner in which the elements were combined is somewhat peculiar to aerolites; the nearest terrestrial affinity of the minerals aggregated in them, is to be found in the volcanic products from great depths. Thus aerolites seem to be broken-up fragments from the interior parts of globes like our own. They do not come from our own volcanoes, for the velocities with which they entered our atmosphere prove their cosmical origin. Had our atmosphere not entangled them, many, circuiting the sun in a parabolic or hyperbolic curve, would have escaped for ever from our system. The swift motions, which they had on entering our atmosphere, are considerably greater on the average than those of comets, and probably their true home is not in our solar system, but in interstellar space.

The aerolites that reach the surface are not always exploded into very small fragments, but every now and then quite large masses remain intact. Most of these are stony; some have bits of iron scattered through them; others are almost pure iron, or with a little nickel alloy, or have pockets in them laden with stone. There are hundreds of accounts of the falls of aerolites during the past 2,500 years. The Greeks and Romans considered them as celestial omens, and kept some of them in temples. One at Mecca is revered by the faithful Mohammedans, and Jehangir, the great Mogul, is said to have had a sword forged from an iron aerolite which fell in 1620 in the Panjab. Diana of Ephesus stood on a shapeless block which, tradition says, was a meteoric stone, and reference may perhaps be found to this in the speech of the town-clerk of the city to appease the riot stirred up against St. Paul by Demetrius the silversmith and his companions:—

Aerolites come singly and unexpectedly, falling actually to earth on land or sea. "Shooting stars" come usually in battalions. They travel together in swarms, and the earth may meet the same swarm again and again. They are smaller than aerolites, probably mere particles of dust, and for the most part are entirely consumed in our upper atmosphere, so that they do not actually reach the earth. The swarms travel along paths that resemble cometary orbits; they are very elongated ellipses, inclined at all angles to the plane of the ecliptic. Indeed, several of the orbits are actually those of known comets, and it is generally held that these meteorites or "shooting stars" are the débris that a comet sheds on its journey.

We can never see the same "shooting star" twice; its visibility implies its dissolution, for it is only as it is entrapped and burnt up in our atmosphere that we see it, or can see it. Its companions in a great meteoric swarm, are, however, as the sand on the sea-shore, and we recognize them as members of the same swarm by their agreement in direction and date. The swarms move in a closed orbit, and it is where this orbit intersects that of the earth that we get a great "star shower," if both earth and swarm are present together at the intersection. If the swarm is drawn out, so that many meteorites are scattered throughout the whole circuit of its orbit, then we get a "shower" every year. If the meteor swarm is more condensed, so as to form a cluster, then the "shower" only comes when the "gem of the ring," as it is termed, is at the intersection of the orbits, and the earth is there too.

Such a conjunction may present the most impressive spectacle that the heavens can afford. The Leonid meteor shower is, perhaps, the most famous. It has been seen at intervals of about thirty-three years, since early in the tenth century. When Ibrahim ben Ahmed lay dying, in the year 902 a.d., it was recorded that "an infinite number of stars were seen during the night, scattering themselves like rain to the right and left, and that year was known as the year of stars." When the earth encountered the same system in 1202 a.d. the Mohammedan record runs that "on the night of Saturday, on the last day of Muharram, stars shot hither and thither in the heavens, eastward and westward, and flew against one another, like a scattering swarm of locusts, to the right and left." There are not records of all the returns of this meteoric swarm between the thirteenth century and the eighteenth, but when the earth encountered it in 1799, Humboldt reported that "from the beginning of the phenomenon there was not a space in the firmament equal in extent to three diameters of the moon that was not filled every instant with bolides and falling stars;" and Mr. Andrew Ellicott, an agent of the United States, cruising off the coast of Florida, watched this same meteoric display, and made the drawing reproduced on the opposite page. In 1833 a planter in South Carolina wrote of a return of this same system, "Never did rain fall much thicker than the meteors fell towards the earth; east, west, north, south, it was the same." In 1866 the shower was again heavy and brilliant, but at the end of the nineteenth century, when the swarm should have returned, the display was meagre and ineffective.

The Leonid system of meteorites did not always move in a closed orbit round our sun. Tracing back their records and history, we find that in a.d. 126 the swarm passed close to Uranus, and probably at that time the planet captured them for the sun. But we cannot doubt that some such similar sight as they have afforded us suggested the imagery employed by the Apostle St. John when he wrote, "The stars of heaven fell unto the earth, even as a fig-tree casteth her untimely figs, when she is shaken of a mighty wind. And the heavens departed as a scroll when it is rolled together."

And the prophet Isaiah used a very similar figure—

Whilst the simile of a great aerolite is that employed by St. John in his description of the star "Wormwood"—

St. Jude's simile of the "wandering stars, to whom is reserved the blackness of darkness for ever," may have been drawn from meteors rather than from comets. But, as has been seen, the two classes of objects are closely connected.

The word "meteor" is sometimes used for any unusual light seen in the sky. The Zodiacal Light, the pale conical beam seen after sunset in the west in the spring, and before sunrise in the east in the autumn, and known to the Arabs as the "False Dawn," does not appear to be mentioned in Scripture. Some commentators wrongly consider that the expression, "the eyelids of the morning," occurring twice in the Book of Job, is intended to describe it, but the metaphor does not in the least apply.

The Aurora Borealis, on the other hand, seldom though it is seen on an impressive scale in Palestine, seems clearly indicated in one passage. "Out of the north cometh golden splendour" would well fit the gleaming of the "Northern Lights," seen, as they often are, "as sheaves of golden rays."

CHAPTER XI

ECLIPSES OF THE SUN AND MOON

We do not know what great comets, or aerolites, or "star-showers" were seen in Palestine during the centuries in which the books of the Bible were composed. But we do know that eclipses, both of the sun and moon, must have been seen, for these are not the results of chance conjunctions. We know more, that not only partial eclipses of the sun, but total eclipses, fell within the period so covered.

There is no phenomenon of nature which is so truly impressive as a total eclipse of the sun. The beautiful pageants of the evening and the morning are too often witnessed to produce the same effect upon us, whilst the storm and the earthquake and the volcano in eruption, by the confusion and fear for personal safety they produce, render men unfit to watch their developments. But the eclipse awes and subdues by what might almost be called moral means alone: no noise, no danger accompanies it; the body is not tortured, nor the mind confused by the rush of the blast, the crash of the thunder-peal, the rocking of the earthquake, or the fires of the volcano. The only sense appealed to is that of sight; the movements of the orbs of heaven go on without noise or confusion, and with a majestic smoothness in which there is neither hurry nor delay.

This impression is felt by every one, no matter how perfectly acquainted, not only with the cause of the phenomenon, but also with the appearances to be expected, and scientific men have found themselves awestruck and even overwhelmed.

But if such are the feelings called forth by an eclipse now-a-days, in those who are expecting it, who are prepared for it, knowing perfectly what will happen and what brings it about, how can we gauge aright the unspeakable terror such an event must have caused in ages long ago, when it came utterly unforeseen, and it was impossible to understand what was really taking place?

And so, in olden time, an eclipse of the sun came as an omen of terrible disaster, nay as being itself one of the worst of disasters. It came so to all nations but one. But to that nation the word of the prophet had come—

God did not reveal the physical explanation of the eclipse to the Hebrews: that, in process of time, they could learn by the exercise of their own mental powers. But He set them free from the slavish fear of the heathen; they could look at all these terror-striking signs without fear; they could look with calmness, with confidence, because they looked in faith.

It is not easy to exaggerate the advantage which this must have given the Hebrews over the neighbouring nations, from a scientific point of view. The word of God gave them intellectual freedom, and so far as they were faithful to it, there was no hindrance to their fully working out the scientific problems which came before them. They neither worshipped the heavenly bodies nor were dismayed at their signs. We have no record as to how far the Hebrews made use of this freedom, for, as already pointed out, the Holy Scriptures were not written to chronicle their scientific achievements. But there can be no doubt that, given the leisure of peace, it is a priori more likely that they should have taught astronomy to their neighbours, than have learnt it even from the most advanced.

There must have been numberless eclipses of the moon seen in the ages during which the Canon of Holy Scripture was written. Of eclipses of the sun, total or very nearly total over the regions of Palestine or Mesopotamia, in the times of the Old Testament, we know of four that were actually seen, whose record is preserved in contemporaneous history, and a fifth that was nearly total in Judæa about midday.

The first of the four is recorded on a tablet from Babylon, lately deciphered, in which it states that on "the 26th day of Sivan, day was turned into night, and fire appeared in the midst of heaven." This has been identified with the eclipse of July 31, 1063 b.c., and we do not find any reference to it in Scripture.

The second is that of Aug. 15, 831 b.c. No specific record of this eclipse has been found as yet, but it took place during the lifetime of the prophets Joel and Amos, and may have been seen by them, and their recollection of it may have influenced the wording of their prophecies.

The third eclipse is recorded on a tablet from Nineveh, stating the coincidence of an eclipse in Sivan with a revolt in the city of Assur. This has been identified with the eclipse of June 15, 763 b.c.

The fourth is that known as the eclipse of Larissa on May 18, 603 b.c., which was coincident with the final overthrow of the Assyrian Empire, and the fifth is that of Thales on May 28, 585 b.c.

The earth goes round the sun once in a year, the moon goes round the earth once in a month, and sometimes the three bodies are in one straight line. In this case the intermediate body—earth or moon—deprives the other, wholly or partially of the light from the sun, thus causing an eclipse. If the orbits of the earth and moon were in the same plane, an eclipse would happen every time the moon was new or full; that is to say, at every conjunction and every opposition, or about twenty-five times a year. But the plane of the moon's orbit is inclined to the plane of the earth's orbit at an angle of about 5°, and so an eclipse only occurs when the moon is in conjunction or opposition and is at the same time at or very near one of the nodes—that is, one of the two points where the plane of the earth's orbit intersects the moon's orbit. If the moon is in opposition, or "full," then, under these conditions, an eclipse of the moon takes place, and this is visible at all places where the moon is above the horizon at the time. If, however, the moon is in conjunction, or "new," it is the sun that is eclipsed, and as the shadow cast by the moon is but small, only a portion of the earth's surface will experience the solar eclipse. The nodes of the moon's orbit are not stationary, but have a daily retrograde motion of 3´ 10·64´´. It takes the moon therefore 27^d 5^h 5^m 36^s (27·21222^d) to perform a journey in its orbit from one node back to that node again; this is called a Draconic period. But it takes the moon 29^d 12^h 44^m 2·87^s (29·53059^d) to pass from new to new, or from full to full, i. e. to complete a lunation. Now 242 Draconic periods very nearly equal 223 lunations, being about 18 years 10-1/3 days, and both are very nearly equal to 19 returns of the sun to the moon's node; so that if the moon is new or full when at a node, in 18 years and 10 or 11 days it will be at that node again, and again new or full, and the sun will be also present in very nearly its former position. If, therefore, an eclipse occurred on the former occasion, it will probably occur on the latter. This recurrence of eclipses after intervals of 18·03 years is called the Saros, and was known to the Chaldeans. We do not know whether it was known to the Hebrews prior to their captivity in Babylon, but possibly the statement of the wise king, already quoted from the Apocryphal "Wisdom of Solomon," may refer to some such knowledge.

Our calendar to-day is a purely solar one; our months are twelve in number, but of purely arbitrary length, divorced from all connection with the moon; and to us, the Saros cycle does not readily leap to the eye, for eclipses of sun or moon seem to fall haphazard on any day of the month or year.

But with the Hebrews, Assyrians, and Babylonians it was not so. Their calendar was a luni-solar one—their year was on the average a solar year, their months were true lunations; the first day of their new month began on the evening when the first thin crescent of the moon appeared after its conjunction with the sun. This observation is what is meant in the Bible by the "new moon." Astronomers now by "new moon" mean the time when it is actually in conjunction with the sun, and is therefore not visible. Nations whose calendar was of this description were certain to discover the Saros much sooner than those whose months were not true lunations, like the Egyptians, Greeks, and Romans.

There are no direct references to eclipses in Scripture. They might have been used in the historical portions for the purpose of dating events, as was the great earthquake in the days of King Uzziah, but they were not so used. But we find not a few allusions to their characteristic appearances and phenomena in the books of the prophets. God in the beginning set the two great lights in the firmament for signs as well as for seasons; and the prophets throughout use the relations of the sun and moon as types of spiritual relations. The Messiah was the Sun of Righteousness; the chosen people, the Church, was as the moon, which derives her light from Him. The "signs of heaven" were symbols of great spiritual events, not omens of mundane disasters.

The prophets Joel and Amos are clear and vivid in their descriptions; probably because the eclipse of 831 b.c. was within their recollection. Joel says first, "The sun and the moon shall be dark;" and again, more plainly,—