Therefore each Solar Term has a basically fixed date on the solar calendar. For instance, every year the winter solstice falls between the 21st and the 23rd of December. The summer solstice falls between June 21st and 23rd. And on the average, a new Solar Term arrives once every 15 days.
節氣是依太陽位置而設定，因此若以陽曆來算，每年各個節氣的時間是大致固定的，譬如「冬至」在每年陽曆十二月廿一至廿三日間，「夏至」則在六月廿一至廿三日間，而且平均說起來，十五天就會有一個節氣。