# Apse line

Apse line

In astrodynamics apse line (or line of apsides) is a common name for an imaginary line defined by orbit's eccentricity vector. It is strictly defined for elliptic, parabolic, and hyperbolic orbits. For those orbits it can be imagined as a line:
*between orbit's periapsis and apoapsis - for elliptical orbits; also known as the major axis
*between orbit's periapsis and focus - for parabolic and hyperbolic orbits

Note: For circular orbits apse line is not defined as eccentricity is equal to zero. As it is required as a base for definition of true anomaly it is usually arbitrarily assumed (usually as a line pointing into direction of vernal equinox)

ee also

*Apsis
*Orbit: circular, elliptic, parabolic and hyperbolic
*Eccentricity (orbit) and eccentricity vector
*True anomaly

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• apse line — apsidžių linija statusas T sritis fizika atitikmenys: angl. apse line; line of apsides vok. Apsidenlinie, f rus. линия апсид, f pranc. ligne des apsides, f …   Fizikos terminų žodynas

• apse line — Astron. See line of apsides. * * * …   Universalium

• apse line — The line joining the two points on the earth’s orbit when it is farthest and closest to the sun. The point in the orbit where the earth is closest to the sun is called perihelion, and the point where it is farthest from the sun is known as… …   Aviation dictionary

• apse line — Astron. See line of apsides …   Useful english dictionary

• apse — /æps / (say aps) noun 1. Architecture a vaulted semicircular or polygonal recess in a building, especially at the end of the choir of a church. 2. Astronomy a. → apsis. b. apse line, the line of apsides. See apsis (def. 1b). {Latin …   Australian-English dictionary

• line of apsides — apsidžių linija statusas T sritis fizika atitikmenys: angl. apse line; line of apsides vok. Apsidenlinie, f rus. линия апсид, f pranc. ligne des apsides, f …   Fizikos terminų žodynas

• line of apsides — Astron. the major axis of an elliptical orbit. Also called apse line. * * * …   Universalium

• line of apsides — the major axis of an elliptical orbit * * * Astron. the major axis of an elliptical orbit. Also called apse line …   Useful english dictionary

• apse — apsidal /ap si dl/, adj. apsidally, adv. /aps/, n. 1. Archit. a semicircular or polygonal termination or recess in a building, usually vaulted and used esp. at the end of a choir in a church. See diag. under basilica. 2. Astron. an apsis. [1815… …   Universalium

• Analemma — was also a book by Ptolemy .In astronomy, an analemma (IPA: IPA|/ˌænəˈlɛmə/, Latin for the pedestal of a sundial) is a curve representing the angular offset of a celestial body (usually the Sun) from its mean position on the celestial sphere as… …   Wikipedia