Halley's Comet

A new study likely pushes back the earliest recorded observation of Halley's Comet to 466, B. C., recorded by the Greeks. This beats the previous earliest recorded observation by more than 200 years. That one was made by Chinese astronomers and is solidly Halley because the Chinese gave details about the comet's position in the sky. The Greek observation lacks such specificity.

The same year as the Greeks' recorded sighting of Halley, they also recorded a large meteorite impacting northern Greece. The meteorite likely had nothing to do with the comet, but it did give the Greeks a glimpse of the universe beyond Earth.