# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Astro*Dictionary by Michael Erlewine





2 articles for "Distance"

Distance [DeVore]

Distance in the heavens is measured in Right Ascension or Oblique Ascension, or along the Ecliptic, the Equator, or the Prime Vertical, in (1) Sidereal hours and minutes of Right Ascension along the Equator; (2) degrees and minutes of arc of Oblique Ascension along the Ecliptic, and in degrees and minutes of arc of declination above or below the Equator, or of latitude above or below the Ecliptic. Polar Distance. The angular distance of a celestial object from the pole: 90° minus the declination. Actual Intra-solar system distances are expressed in astronomical Units (q. v.): Ultra-solar system distances in Light Years (q. v.).


See also:
♦ Oblique Ascension ♦ Oblique Descension
Distance [Astro*Index]

Scaled inverse radial distances. Due to an elliptical orbit, a distance from the Sun varies with time. The orbital point closest to the Sun is called perihelion; the point most distant, aphelion. Radial distance of a planet from the Earth varies considerably, from perigee (closest) to apogee (furthest). Astronomers measure both heliocentric and geocentric radial distances in AUs (Astronomical Units). Astrologers also use scaled inverse Radial Distances where "100" represents perigee/perihelion and "0" represents apogee\aphelion. The proximity of Jupiter to the Earth in relation to earthquakes is being investigated by astronomers and geologists.


See also:
♦ Elliptical Orbit ♦ Perihelion ♦ Aphelion ♦ Perigee ♦ Apogee ♦ Astronomical Unit


Astro*Index Copyright © 1997 Michael Erlewine