ations. In the literature, <i>l&#236;yu&#225;n</i> is sometimes translated as <i>system origin</i>. In modern astronomy, the term <a href="https://en.wikipedia.org/wiki/Epoch_(astronomy)" target="_blank"><i>epoch</i></a> has several meanings. One of them is a temporal point of origin from which time is measured. Therefore, 曆元 is used as the Chinese translation for the term <i>epoch</i> used in modern astronomy. Thus, it seems that <i>epoch</i> is a better translation for <i>l&#236;yu&#225;n</i> used in 