关键词: 回归年, 朔望月, 阴阳历换算

Abstract: Applying tropical year and lunation, the exchange formula of lunar calendar and solar calendar could be derived. It begins from a given lunar date. Through several integer tropical years, the present solar date can be derived. There are three different formulas for this. On the contrary, there are another three different formulas for the exchange from solar date to lunar date in this paper.

Key words: tropical year, lunation, exchange of lunar calendar and solar calendar