That which is on high at the summit, at the crest, at the zenith, that which sends down so much light on the earth, sees but little, sees badly, sees not at all?
那个在上空，在顶端，在最高峰，在天顶上的东西，它送给大地无穷光明，但它看见的很少，看不清或完全看不见？
The reverse time of the crest motion depends on the smallest zenith Angle and on solar cycle.
运动的反向时间随太阳的最小天顶角的大小而变化，随太阳活动而变化。
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