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Earth, Moon, and the Sun
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12.1 Rotation
Earth spins once in about 24 hours
Day and Night
Caused by spinning West to East
12.2 Revolution
Earth orbits the Sun in a year
12.2.1 Changing Sky
Different stars each season
12.2.2 Seasons
Caused by the tilt of the axis
12.3 Eclipses
When one body blocks the Sun
12.3.1 Solar Eclipse
Moon comes between Sun and Earth
12.3.2 Lunar Eclipse
Earth comes between Sun and Moon