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Title: Earth-Sun Relations.
Caption: This animation shows one complete orbit of the Earth around the Sun. It demonstrates the important relationships between hours of daylight, the subsolar point, and the solstices and equinoxes. The Arctic Circle, Tropic of Cancer, equator, and Tropic of Capricorn are clearly shown.
Keywords: seasons, Sun, solar radiation, insolation, summer solstice, winter solstice, solstices, spring equinox, fall equinox, equinoxes, Tropic of Cancer, Tropic of Capricorn, Arctic Circle, day lengths