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perihelio

The point where (and when) an object orbiting the sun is closest to the sun.

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argumento del perihelio (ω, longitud del perihelio)
Astronomy; General astronomy

Angular distance (measured in the plane of the object's orbit and in the direction of its motion) from the ascending node to the perihelion point.

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The path of one object about another (used here for an object orbiting the sun).

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Astronomy; General astronomy

The point directly overhead in the sky.

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