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It is the point at which a celestial object that revolves around the Earth is at its minimum distance from our planet. The maximum distance point is Apogee.

When the orbit of a body that revolves around the Earth is almost circular, there is no big difference, in terms of distance, between perigee and apogee; On the other hand, when it is relatively elliptical, the distance is more marked.

The Moon, for example, whose orbit has an Excentnity of 0.0549, has a distance of 356,410 km from the perigee; at the height of 406,740 km. These two extreme points of the orbit are called Apsides.

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Penumbra (astronomy)Perihelion