Liu Xin (astronomer)
Liu Xin ( Chinese 劉歆 / 刘歆 , W.-G. Liu Hsin ; † 23 AD ) was an astronomer and historian of the Chinese Xin dynasty . His father was the author Liu Xiang . Liu Xin is the originator of an astronomical system called "triple correspondence," which he described and published in a book in AD 8. Therein it determines the synodic period of the moon, with 29 43 / 81 days and a sum of 235 synodic periods than 19 years. According to this, the length of a year would be 365.25016 days, which is only eleven minutes longer than the current value.
In addition, Liu Xin wrote a catalog with 1080 stars, in which he gives the apparent brightness on a six-digit scale. He also mentions the work of the official Fu Buqi (宓 不齊, 6th century BC). He also calculated the orbital times of some planets.
The Liu Hsin crater on Mars has been named after him since 1973 . The first known bibliography of his works is known as the Qilüe .
Individual evidence
| personal data | |
|---|---|
| SURNAME | Liu Xin |
| BRIEF DESCRIPTION | Xin Dynasty astronomer |
| DATE OF BIRTH | 1st century BC Chr. |
| DATE OF DEATH | 23 |