RT @NASA: Learn why equinoxes & solstices occur and watch this amazing @NASAGoddard video that was shot from space! http://go.nasa.gov/GAZsF0
RT @NASA: Learn why equinoxes…
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RT @NASA: Learn why equinoxes & solstices occur and watch this amazing @NASAGoddard video that was shot from space! http://go.nasa.gov/GAZsF0
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