回回天文历法自唐宋传入中国至今,已有千年的历史了,在这漫长的岁月中,中国人对它是有所研究的.那么,这些研究的进程如何?研究过程中所着重讨论的问题是什么?就目前情况看,还有哪些缺陷和不足?所有这些,正是本文要予以讨论的. Returning to the Astronomical Calendar Since the introduction of the Chinese calendar into the Tang and Song Dynasties, there have been millennia of history, and in this long period of time the Chinese have studied it. So what are the progress of these researches? What are the problems? What are the shortcomings and shortcomings of the current situation? All of these, it is to be discussed in this article.