10 articles for "Right Ascension"

**Right Ascension**[Prima]

The first of the two coordinates of the equatorial system of celestial coordinates (the other coordinate is declination). Right Ascension is measured northward from the east point of the equator to the vertical circle (90° to the equator) that runs through the planet or point to be measured.

See also:

♦ Equatorial Coordinates ♦ Celestial Coordinates ♦ Declination ♦ Equator

**Right Ascension**[Munkasey M.]

A measurement in Hours - Minutes - Secords, or degrees, along the Celestial Equator from the point of Aries counterclockwise to the Hour Circle of a body. "a" is also used to represent the "Semi-Major Axis" in an Ellipse.

See also:

♦ Equatorial Coordinates ♦ Celestial Coordinates ♦ Declination ♦ Equator

**Right Ascension**[DeVore]

Distance measured along the celestial equator, Eastward from the point of the Spring Equinox; or, as sometimes described, distance along the circle of declination. v. Celestial Sphere.

See also:

♦ Equatorial Coordinates ♦ Celestial Coordinates ♦ Declination ♦ Equator

**Right Ascension of the IC**[Munkasey M.]

That right ascension value which is 180 degrees in value from the RAMC.

See also:

♦ Equatorial Coordinates ♦ Celestial Coordinates ♦ Declination ♦ Equator

**Right Ascension of the Midheaven (RAMC)**[Astro*Index]

The right ascension of the local Upper Meridian.

See also:

♦ Right Ascension ♦ Celestial Coordinates

**Right Ascension of the Midheaven (RAMC)**[Munkasey M.]

The right ascension value from which the MC is derived. The right ascension value associated with the local meridian in the Southerly direction in the Northern hemisphere and the Northerly direction in the Southern hemisphere. The name of the point where the local meridian and the Celestial Equator intersect. The value of the LST when it is expressed in degree and not time units.

See also:

♦ Right Ascension ♦ Celestial Coordinates

**Right Distance**[DeVore]

That from one point to any other, in terms of Right Ascension.

See also:

♦ Equatorial Coordinates ♦ Right Ascension

**Right Longitude**[Astro*Index]

The point at which an Hour Circle intersects the Ecliptic. Synonymous with Ecliptic Intercept.

See also:

♦ Hour Circle ♦ Ecliptic ♦ Ecliptic Intersect

**Right Sphere**[Astro*Index]

An aspect of the Celestial Sphere at which all equatorial parallels are at right angles to the Horizon. This occurs only at geographic latitudes which lie on the Earth's Equator.

See also:

♦ Equator ♦ Celestial Horizon ♦ Celestial Sphere

**Right Sphere**[DeVore]

One in which afl equatorial parallels are at right angles to the horizon: a sphere that has the equator for prime vertical, and the poles for horizon. Days and nights would always be of equal duration. Any point on the equator has a zenith in a right Sphere.

See also:

♦ Equator ♦ Celestial Horizon ♦ Celestial Sphere

Astro*Index Copyright © 1997 Michael Erlewine

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