perigee etymology

Etymology:

  • Greek: περιγαῖον (perigaion), from
    • περί (peri) - "around"
    • Γῆ (Gē) - "Earth"

Meaning:

  • The point in the orbit of a celestial body (such as the Moon) when it is closest to the Earth.

Origin:

The term "perigee" was first used in the 16th century by the French astronomer Nicolas Copernicus, in his book "De Revolutionibus Orbium Coelestium" (On the Revolutions of the Heavenly Spheres).

In the original Greek, "perigaion" referred specifically to the Moon's closest approach to the Earth. However, the term has since been extended to describe the closest point in the orbit of any celestial body (e.g., an artificial satellite or asteroid) around another body.

The opposite of perigee is apogee, which is the point in an orbit when the celestial body is farthest from the Earth or other object.

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