節氣中國古代將一(約莫係家下西曆一年)等分做廿四點嘅,幫助辦別季節時令,助農夫耕田。因為中國紀日係睇月光,唔係太陽,所以節氣響黃曆嘅日子唔係固定,相反,西曆同太陽同步,所以年年節氣日子差唔多。節氣定法分兩種,一種係平氣,即係一歲平均分為廿四分。另一種係定氣,將黃道平分廿四分,用太陽經過節氣角度嗰日來計。由於一歲之中,太陽響黃道行速唔係一樣,所以節氣之間日數差係有唔同。咁樣平氣同定氣計出來嘅係差少少。

節氣分法

節氣分節同氣,節係將黃道十二分,而氣就係節同節中間個位,亦都有十二個。

古人好重視節氣,其中冬至係一歲之日頭最短,畀人定歲首。而夏至係佢嘅相反,一年之中日頭最長。兩個夾埋叫二至。冬至到夏至正中間係春分,夏至到冬至正中間係秋分,呢兩個日夜一樣長,叫二分,跟住冬至到春分中間叫立春、春分到夏至中間叫立夏,夏至到秋分叫立秋,秋分到冬至中間叫立冬。統稱四立。二至二分四立,夾埋就叫八節

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