Who is the lunar calendar?

Who invented the lunar calendar, Tang Ruowang? Inventor of lunar calendar: German missionary Tang Ruowang. At the end of Ming Dynasty, according to the calendar made by Guo Shoujing before Yuan Dynasty, there were many mistakes in the prediction of solar and lunar eclipses, so the Ming court had to revise the calendar. At this time, the western missionaries had already got in touch with China, so they asked the western missionaries to assist in editing. Lunar calendar is the current modern calendar in China, which belongs to the combined calendar of yin and yang, that is, the combined calendar of lunar calendar and solar calendar. According to the change cycle of the moon phase, each moon phase changes to one month, and the reference solar year is the length of one year, 24 solar terms are added, and leap months are set to make the average calendar year adapt to the tropic year.