Heliocentric longitude
Longitude Lon"gi*tude, n. [F., fr. L. longitudo, fr. longus long.] 1. Length; measure or distance along the longest line; -- distinguished from {breadth} or {thickness}; as, the longitude of a room; rare now, except in a humorous sense. --Sir H. Wotton. [1913 Webster]

The longitude of their cloaks. --Sir. W. Scott. [1913 Webster]

Mine [shadow] spindling into longitude immense. --Cowper. [1913 Webster]

2. (Geog.) The arc or portion of the equator intersected between the meridian of a given place and the meridian of some other place from which longitude is reckoned, as from Greenwich, England, or sometimes from the capital of a country, as from Washington or Paris. The longitude of a place is expressed either in degrees or in time; as, that of New York is 74[deg] or 4 h. 56 min. west of Greenwich. [1913 Webster]

3. (Astron.) The distance in degrees, reckoned from the vernal equinox, on the ecliptic, to a circle at right angles to the ecliptic passing through the heavenly body whose longitude is designated; as, the longitude of Capella is 79[deg]. [1913 Webster]

{Geocentric longitude} (Astron.), the longitude of a heavenly body as seen from the earth.

{Heliocentric longitude}, the longitude of a heavenly body, as seen from the sun's center.

{Longitude stars}, certain stars whose position is known, and the data in regard to which are used in observations for finding the longitude, as by lunar distances. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • heliocentric longitude — noun : the celestial longitude of a celestial body as if seen from the center of the sun opposed to geocentric longitude …   Useful english dictionary

  • Longitude — Lon gi*tude, n. [F., fr. L. longitudo, fr. longus long.] 1. Length; measure or distance along the longest line; distinguished from {breadth} or {thickness}; as, the longitude of a room; rare now, except in a humorous sense. Sir H. Wotton. [1913… …   The Collaborative International Dictionary of English

  • Longitude stars — Longitude Lon gi*tude, n. [F., fr. L. longitudo, fr. longus long.] 1. Length; measure or distance along the longest line; distinguished from {breadth} or {thickness}; as, the longitude of a room; rare now, except in a humorous sense. Sir H.… …   The Collaborative International Dictionary of English

  • longitude — Synonyms and related words: Antarctic Zone, Arctic Circle, Arctic Zone, Cartesian coordinates, Frigid Zones, Lambert conformal projection, Mercator projection, Miller projection, Torrid Zone, Tropic of Cancer, Tropic of Capricorn, Variable Zones …   Moby Thesaurus

  • longitude of perihelion — the heliocentric longitude of the perihelion point of a planet s or comet s orbit as usually measured along the ecliptic to the orbit s node and thence along the orbit to the perihelion point …   Useful english dictionary

  • Heliocentric — He li*o*cen tric (h[=e] l[i^]*[ o]*s[e^]n tr[i^]k), Heliocentrical He li*o*cen tric al (h[=e] l[i^]*[ o]*s[e^]n tr[i^]*kal), a. [Helio + centric, centrical: cf. F. h[ e]liocentrique.] (Astron.) pertaining to the sun s center, or appearing to be… …   The Collaborative International Dictionary of English

  • Heliocentric parallax — Heliocentric He li*o*cen tric (h[=e] l[i^]*[ o]*s[e^]n tr[i^]k), Heliocentrical He li*o*cen tric al (h[=e] l[i^]*[ o]*s[e^]n tr[i^]*kal), a. [Helio + centric, centrical: cf. F. h[ e]liocentrique.] (Astron.) pertaining to the sun s center, or… …   The Collaborative International Dictionary of English

  • Heliocentric place — Heliocentric He li*o*cen tric (h[=e] l[i^]*[ o]*s[e^]n tr[i^]k), Heliocentrical He li*o*cen tric al (h[=e] l[i^]*[ o]*s[e^]n tr[i^]*kal), a. [Helio + centric, centrical: cf. F. h[ e]liocentrique.] (Astron.) pertaining to the sun s center, or… …   The Collaborative International Dictionary of English

  • longitude — Heliocentric He li*o*cen tric (h[=e] l[i^]*[ o]*s[e^]n tr[i^]k), Heliocentrical He li*o*cen tric al (h[=e] l[i^]*[ o]*s[e^]n tr[i^]*kal), a. [Helio + centric, centrical: cf. F. h[ e]liocentrique.] (Astron.) pertaining to the sun s center, or… …   The Collaborative International Dictionary of English

  • Heliocentric orbit — A heliocentric orbit (also called circumsolar orbit) is an orbit around the Sun. All planets, comets, and asteroids in our Solar System are in such orbits, as are many artificial probes and pieces of debris. The moons of planets in the Solar… …   Wikipedia

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