This Mosaic spans a slice of space that is equal to about a third of the diameter of the full moon (10 arc minutes).
这些镶嵌的空间切片的跨度相当于一个满月直径的三分之一(10弧分)。
By day, measure from the Sun to the Moon and add that distance to the ascendant, but by night the arc must he subtracted from the ascendant.
白天，测量从太阳到月亮的距离，并加上到上升的距离。但是，在晚上，弧度必须从上升减去。
When the moon is new it lokos like an arc of light in the sky.
新月看起来像天空中的一盏弧形灯。
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