朔望月

yǐ huí guī nián hé shuò wàng yuè wéi jī chǔ cóng ér tuī dǎo chū yīn yáng lì rì qī huàn suàn gōng shì

以回归年和朔望月为基础，从而推导出阴、阳历日期换算公式。

Applying tropical year and lunation, the exchange formula of lunar calendar and solar calendar could be derived.