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Immanuel Velikovsky

Velikovsky's Worlds in Collision, a book which asserts, among many other things, that the planet Venus did not exist until recently. Some 3500 years ago in the guise of a gigantic comet, it grazed Earth a couple of times, after having been ejected from the planet Jupiter some indefinite time earlier, before settling into its current orbit. Velikovsky (1895-1979), a psychiatrist by training, did not base his claims on astronomical evidence and scientific inference or argument. Instead, he argued on the basis of ancient cosmological myths from places as disparate as India and China, Greece and Rome, Assyria and Sumer.

Halley’s Comet

Halley's Comet is the best-known of the short-period comets, and is visible from Earth every 75 to 76 years. Halley is the only short-period comet that is clearly visible to the naked eye, and thus, the only naked-eye comet that might appear twice in a human lifetime. Other naked-eye comets may be brighter and more spectacular, but will appear only once in thousands of years. Halley's returns to the inner solar system have been observed by astronomers since at least 240 BC, and recorded by Chinese, Babylonian, and mediaeval European chroniclers.