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'Liu Xin' (, d. 23), courtesy name 'Zijun' (子駿), was the son of Liu Xiang, a Chinese astronomer and historian during the Xin Dynasty. He created a new astronomical system, called "Triple Concordance". He published this system in the year 8 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.

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References

★ Bin, Hansheng, "Liu Xin". ''Encyclopedia of China'' (Philosophy Edition), 1st ed.