Old Naval Telescopes

Washington, D.C., 美国 中的 天文台
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Its mission includes determining the positions and motions of the Earth, Sun, Moon, planets, stars and other celestial objects; providing …

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常见问题解答

问:
What Causes the Equation of Time?
答:
First, it is important to realize that all of our modern timekeeping systems ultimately have been based on the apparent daily motion of celestial objects in the sky, with...
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