清·李光地等奉敕撰 · Chapter 24 / 273

节气时刻

144 characters

Chapter 24 of 273

一嵗之内日一周天厯十有二宫其交每宫十五度者为节其交每宫初度者为气然七政之行起于子正有今日子正尚未交而明日子正已过者则以三率之术求之而知其为某时刻也但地之经度不同故京师为午正者自东方视之则已过矣自西方视之则犹未及也是以在东者交节晚在西者交节早东西不同时刻亦异故各省节气时刻皆以地之经度而定焉

The text above is reproduced verbatim from the source: no translation, summary or rewriting.