Our Corner of the Universe. 100 mil ly. 5 mil ly. Our Neighborhood. Earth’s rotation, orbit and the seasons. Only 50\% of the Earth’s surface can be “lit” by the sun Because the Earth’s axis is tilted the area covered by this 50\% varies throughout the year. Most important variables.
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100 mil ly
5 mil ly
The Earth’s axis of rotation is tilted at 23.5° from the perpendicular