explaining the phases of the moon and earth-based evidence of the heliocentric model. There are 40 full-color pages. The photos are NASA space photos, but NASA did not participate in the writing or publication of this eBook. Educators may use this material in the classroom for the purpose of teaching astronomy concepts. Contents include our solar system, the lunar phases, solar and lunar eclipses, seasons, the shape of the earth, and geocentric and heliocentric models of the solar system (including evidence for the heliocentric model).

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