出典:Wikipedia
出典:『Wikipedia』 (2009/12/16 14:41 UTC 版)
The celestial horizon, also called the rational horizon, is a great circle parallel to the horizon, in which a plane at right angles to Zenith and Nadir lines are passing through the centre of the earth and intersects the celestial sphere, the center of which is the center of the Earth.
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the celestial horizon
the visible horizon
大空.
太陽.
the eye of heaven
the clear sky
the open sky
the celestial body