为了定出平时,天文学家想象出一个 平太阳 ( mean sun )的概念. 平太阳 是永远顺着天球赤道运行,因此每次经过同一子午圈间隔的时间完全一致,也因此有时在真太阳之前,有时又落后了.
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hour angle of mean sun 平太阳时角
right ascension of mean sun 平太阳赤经
right ascension mean sun 平太阳赤经
Greenwich hour angle mean sun 格林尼治平太阳时角
fictitious mean sun 假平太阳 ; 假想平均太阳
mean sun hour angle 平均太阳时角
mean Earth-Sun distance 日地平均距离 ; 当地球位于日地平均距离
以上来源于: WordNet
N an imaginary sun moving along the celestial equator at a constant rate and completing its annual course in the same time as the sun takes to move round the ecliptic at a varying rate. It is used in the measurement of mean solar time 平均日照
What do you mean 'moon and sun'?
你说的‘太阳和月亮’是什么意思？
You see here the six planets that were known at the time, and the mean distance to the Sun.
这是当时已知的，六个行星，以及于太阳的平均距离。
Perfect conditions mean that you aren't in water or sweating, two things that usually go hand in hand with the sun.
理想的条件意味着你不是在水里或出汗。 而这两个事情通常和阳光密切联系在一起。
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