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481402
Caption: Celestial spheres showing the positions of the vernal and autumnal equinoxes.
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 18.60 MB
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506996
Caption: Although the Moon is often described as orbiting Earth, the two orbit each other about a common center of mass, the barycentre
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 14.30 MB