Planetary Geometry - NASA

Planetary Geometry Handbook MarsPositional Data, 1990-2020 Andrey B. Sergey_vsky ... Definition of vernal equinox ..... 2 2. DefinitionofSun-and Earth-to-planetdistance,and ... "k sky (as seen from Earth's center) at the time of each spring" equinox., Both the equatol and the orbit plane of each planet slowly ................
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