Halley's Comet:

This famous celestial object was in the night sky when Mark Twain was born and returned to Earth when Twain passed away.

Twain revelled in the realization of comparing his lifespan to that of the comet's seventy-six year system orbit:
"Now here are these two unaccountable freaks; they came in together, they must go out together."
*

*Mark Twain's Autobiography