Guo Shoujing, (Some people say that he is Tycho of China, but I agree with another statement. Tycho is the Guo Shoujing of the West, because Guo Shoujing's achievements are no less than Tycho's and earlier than Tycho's. ) formulated the most accurate calendar in ancient times, and it was not until the calendar based on telescope observation was introduced to the west that it was abolished and used for hundreds of years.

Zhang Heng, the monk and his entourage, and Zu Chongzhi were all famous astronomers in ancient China. Specific examples can be searched online.

Ls's statement is too self-abased The ancient calendar in China is a lunar calendar, which is combined with the concern about the moon and the farming season. I think this is a very good calendar. The leap of 65438+7 in 2009 is our own law. Although it came later than Mohongzhang in ancient Egypt, it is also a splendid cultural treasure. As for what the Arabs say, I am interested in reading the original text, because I have never heard of it.

I also recommend that you look at the last paper in the third issue of Astronomy Magazine this year, and see how our ancestors built astronomical observatories thousands of years before the appearance of words.