Thomas Henderson, Scottish astronomer and mathematician (died 1844)

Thomas Henderson FRSE FRS FRAS was a Scottish astronomer and mathematician noted for being the first person to measure the distance to Alpha Centauri, the major component of the nearest stellar system to Earth, the first to determine the parallax of a fixed star, and for being the first Astronomer Royal for Scotland.

December 28 is the 362nd day of the year in the Gregorian calendar; three days remain until the end of the year.