Why can Zhuge Liang know the astronomical phenomena in two thousand years?

In ancient times, the laws of astronomical phenomena were always elusive ~ ~ Not only Zhuge Liang of the ancients ~ ~ The Book of Changes, but even ancient fortune tellers were able to observe astronomical phenomena ~ ~ In ancient times, these people were called magicians (unlike wizards ~). The lunar calendar was written by the ancients by observing the astronomical phenomena ~ It was called the imperial calendar in ancient times ~ ~ It was compiled by the court ~ ~ People in the Han Dynasty looked at the sky, not to mention Zhuge Liang ~