Aphelion
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All planets and most comets in the solar system orbit the Sun in an elliptical orbit, with the Sun at one focus of the ellipse. The point on an orbit where the planet is farthest from the Sun is called the aphelion. It is opposite the perihelion, where the planet is closest to the Sun. Earth reaches aphelion in early July, when it is about 152 million km from the Sun. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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太陽系内のすべての惑星および彗星の多くは，太陽の周囲を楕円形の軌道を描いて公転し，太陽はその楕円の1つの焦点に位置を占める。そこで，軌道上の太陽に最も遠くなる点を遠日点という。最も近くなる近日点の反対側にある。地球は7月初めに遠日点に達し，そのときの太陽からの距離は約1億 5200万 kmである。
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