Gan De

Occupation: Astronomer and Mathematician

Year born: Around 400 BCE

Research Areas: Jupiter’s movements, Star maps, Sunspots


"[Jupiter] ...was very large and bright. Apparently, there was a small reddish star appended to its side. "

Source: Treatise on Astrology of the Kaiyuan Era, xxiii


Early Life


Juno is a NASA spacecraft orbiting the planet Jupiter. It was launched in August 2011 and finally reached Jupiter in July 2016. It has been orbiting the planet ever since. Juno is the second mission to orbit Jupiter; the Galileo spacecraft orbited the planet from 1995 to 2003.