longitude$45392$ - translation to ελληνικό
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longitude$45392$ - translation to ελληνικό

LONGITUDE (MEASURED FROM THE POINT OF THE VERNAL EQUINOX) AT WHICH THE PERIAPSIS (CLOSEST APPROACH TO THE CENTRAL BODY) WOULD OCCUR IF THE BODY'S INCLINATION WERE ZERO
Longitude of periapsis; Longitude of periastron; Longitude of perihelion; Longitude of periapse; Longitude of pericenter; Longitude of perigee
  • ϖ = Ω + ω in separate planes.

longitude      
n. γεωγραφικό μήκος
eastern hemisphere         
THE HALF OF EARTH THAT LIES EAST OF THE PRIME MERIDIAN AND WEST OF THE ANTIMERIDIAN
Eastern hemisphere; East Hemisphere; Eastern longitude
ανατολικό ημισφαίριο
Western Hemisphere         
THE HALF OF EARTH WHICH LIES WEST OF THE PRIME MERIDIAN AND EAST OF THE ANTIMERIDIAN
Western hemisphere; American hemisphere; American Hemisphere; 🌎; Western Earth; West hemisphere; Western longitude
δυτικό ημισφαίριο

Ορισμός

longitude
Distance east or west of the Greenwich meridian.

Βικιπαίδεια

Longitude of the periapsis

In celestial mechanics, the longitude of the periapsis, also called longitude of the pericenter, of an orbiting body is the longitude (measured from the point of the vernal equinox) at which the periapsis (closest approach to the central body) would occur if the body's orbit inclination were zero. It is usually denoted ϖ.

For the motion of a planet around the Sun, this position is called longitude of perihelion ϖ, which is the sum of the longitude of the ascending node Ω, and the argument of perihelion ω.: p.672, etc. 

The longitude of periapsis is a compound angle, with part of it being measured in the plane of reference and the rest being measured in the plane of the orbit. Likewise, any angle derived from the longitude of periapsis (e.g., mean longitude and true longitude) will also be compound.

Sometimes, the term longitude of periapsis is used to refer to ω, the angle between the ascending node and the periapsis. That usage of the term is especially common in discussions of binary stars and exoplanets. However, the angle ω is less ambiguously known as the argument of periapsis.