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Galileo's Drawing of Moon Phases - Windows to the Universe

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Galileo Galilei's "The Phases of the Moon"
Image courtesy of Biblioteca Nazionale - Florence, Italy


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People have been wondering about what they see in the sky for a long time. We interpret what we see in a cultural context through mythology and in the context of science through the laws of the physical...more

Phases of the Moon

The diagram shows the Earth, and the Moon in different positions along its orbit around the Earth. The Sun is off in the distance, lighting the Earth-Moon system. At any position, half of the Moon is reflecting...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF