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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