A young boy named Billy meets Nimbus, a Geography Fairy, and together they chase a runaway Equator across a series of whimsical episodes. They travel by enchanted trolley and encounter personified natural forces and curious creatures—sunbeams, an Equine Ox, meteors, and lands where night endures for months—while playful explanations of tides, meridians, and compasses weave through the adventure. The narrative unfolds episodically as a sequence of imaginative vignettes that anthropomorphize geographic features and blend childlike wonder with light lessons about belief, curiosity, and the order of the natural world.