Liu Hsin
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Liu Hsin (circa 22) was a Chinese astronomer. His name is also translated as Liu Xin.
During the Han Dynasty he created a new astronomical system, called "Triple Concordance". He published this system in the year 25 as section of his textbook. In it he provided the following periods:
- The Moon phase period (synodic month): 29 43/81 days.
- A total of 235 synodic months add up to 19 years.
Therefore his number of days in one year was 365.25016, which is 11 minutes longer than the current value.
He also created a catalog of 1080 stars, where he used the scale of 6 magnitudes. He also calculated periods for planets.
A crater on Mars was named in his honor.Template:Astronomer-stub