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Unformatted text preview: o o What if no tilt ? . ......... No seasons. Motions of the Earth-Moon-Sun system Phases of the Moon The appearance of the moon changes in a repeating manner called the phases of the moon. You can figure out the phase of the moon by drawing a line from the Earth (blue) to the Moon. Then draw a line through the moon which is perpendicular to the Earth-moon line. Anything on the Earth side of this line will be visible from Earth. In the case shown above, there is more light part of the moon visible than dark. The result will be that we see a "gibbous" moon as show in the right side. "gibbous" - from the Latin for "round and bulging" ....
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