The most famous comet of history is called Halley‟s Comet, which appears every 75 or 76 years. It was named to honor Sir Edmond Halley, an English astronomer who predicted that the comet would appear in 1758; he himself could not see the comet because it appeared sixteen years after his death. Halley‟s Comet is extremely bright and has two tails. If you had looked at the sky in 1986, you would have seen Halley‟s Comet; it will return in 2061, then if you look at the sky, you will probably see it.

From Sky and Telescope