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seasons are caused by this tilt of Earth on its axis causes day and night Earth's rotation moon is blocked from view lunar eclipse 1/4 size of Earth size of moon Collision Theory moon was formed when a large object from space knocked material from the Earth into orbit. sun is blocked from view solar eclipse supports Collision Theory moon rocks are made from molten material Earth's revolution occurs every 365 1/2 days Earth is tilted toward the sun in the northern hemisphere summer is in the northern hemisphere spring occurs then vernal equinox solstice sun is at 23.5 degrees north or south latitude cause for moon phases amount of sunlit side of the moon we see dark, flat areas on the moon maria the moon's rotation and revolution taking the same length of time causes this we see only one side of the moon reason we see features on the moon clearly Galileo's perfection of the telescope length of time it takes the moon to revolve around Earth 27.3 days