Feb. 9 — This date in 1986 marked the last, best day we would see Halley’s Comet for another 75–76 years. If you missed it, GenX’ers, it’s OK. It’ll be back in 2061.
The only known short-period comet visible to the naked eye, observers had noted it since 240 BC. But Edmond Halley (rhymes with “valley”) predicted in 1705 that it would return in 1758. He died in 1742 but was proven correct when it appeared Dec. 25, 1758.