At the Poles, the Sun circles around the horizon forever. At the Equator, it rises vertically at the East point on the horizon, passes directly overhead, and then sets vertically at the West point on the horizon (Seligman). These same mechanics should apply for other solar and planetary systems as well.

As an example, the seasons on the other planets in our solar system compare to the seasons on the Earth. Planets, such as Mercury, Venus and Jupiter, which have a tilt near zero or 180 degrees, so that their axis of rotation is perpendicular to their orbit, have no seasons. Planets, such as Mars, Saturn and Neptune, which have a tilt similar to that of the Earth, have seasons similar to the Earth (although all three of those planets, being further from the Sun, have longer seasons, and colder ones, than the Earth). Planets, such as Uranus and Pluto,...
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