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Astrology keeps failing rigorous tests of predictive power, yet millions still organize their lives around it. These views span the science that debunks it, the cognitive biases that sustain belief, and the case for horoscopes as tools for self-reflection rather than prediction. Weighing them shows what astrology can't do and what it still does for people anyway.

Sailors in 1492 knew perfectly well the Earth was round; the flat-Earth panic is a later invention. These arguments split on how the myth was born and spread, from Washington Irving's 19th-century storytelling to how far medieval Europeans ever doubted roundness at all. Tracing the invention shows how a false history can outlive the truth for centuries.