七政四餘月的高度

罗计定义为黄道和白道两个平面的交点, 计点为升交点, 月亮经过计都点后, 月亮位于黄道平面之上; 月亮经过罗睺点之后, 月亮在黄道平面之下, 日月位于罗计两点上时, 日地月在同一直线上, 日光被遮挡形成日月食现象, 这是为大众所知的一个天象关联, 但是, 罗计还有更多意义, 如罗计的位置还决定了月亮在天空中的高度.

从图中可知, 当月亮与罗计( 羅㬋，計都)连线呈90度时, 月亮高度达到最低或最高

以太阳的高度作为对比理解这个结论, 太阳所在的黄道面与地球赤道面同样不在一个平面, 戌宫的春分点相当于白道平面的计都点, 夏至点与春分点呈90度, 当太阳位于夏至点时, 高度最高.

Reference

Astrosanhita in vedic astrology

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