Longitude, Celestial: The distance in degrees (arc) from 0° Aries eastward to any given point that intersects the ecliptic. Celestial longitude is measured from 0° to 360°. For example, 10° Taurus is expressed astronomically as longitude 40°.

 

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Longitude, Celestial: The distance in degrees (arc) from 0° Aries eastward to any given point that intersects the ecliptic. Celestial longitude is measured from 0° to 360°. For example, 10° Taurus is expressed as . . . View Full Definition

Longitude, Geographical Or Terrestrial: The distance in arc a given point on Earth lies east or west of the prime meridian, which passes through Greenwich, England (0° longitude). Geographical longitude is measured from 0° to 180° . . . View Full Definition

Longitude, Zodiacal: The position of a given point along the ecliptic expressed in terms of the zodiac.

Latitude, Celestial: Angular distance measured north or south of the plane of the ecliptic.

Celestial Equator: The projection of the plane of the geographical equator upon the celestial sphere.

Celestial Sphere: The apparent sphere of infinite radius having the earth as its center. All heavenly bodies (planets, stars, etc.) appear on the 'inner surface' of this sphere and the sun moves along the ecliptic.

Celestial Body: A physical form which exists in space; such as a planet.