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Gan De
4th-century BC Chinese astronomer and astrologer · Scientists
Gan De, also known as the Lord Gan, was an ancient Chinese astronomer and astrologer born in the State of Qi.
Gan De is read about 32 times a day, in 22 languages.
A typical day, 30 days to 10 October 2026
The middle day of the days counted, so one week of news cannot move it. The line under it is the last 120 days, one point a day.
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Along with Shi Shen, he is believed to be the first in history known by name to compile a star catalogue, preceded by the anonymous authors of the early Babylonian star catalogues and followed by the Greek Hipparchus who is the first known in the Western tradition of Hellenistic astronomy to have compiled a star catalogue. He also made observations of the planets, particularly Jupiter. His writings are lost, but some of his works' titles and fragments quoted from them are known from later texts.
