月在天所行嘅道 From Wikipedia, the free encyclopedia
白道,月在天所行嘅道。白道同黃道好近,夾角平均為五度左近,即黃白交角。兩道相交之處,為升交點同降交點,若果月行到依兩點,就有日食月食。
古時二十八宿均在白道,所以叫月舍。
交角變化不定,少則四度五十七分,多則五度十九分,平均五度九分,一百七十三日為一周期。
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