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Astro*Dictionary by Michael Erlewine

 

 

 

 

13 articles for "Light"

Light [Astro*Index]

Scientifically, that portion of the electromagnetic spectrum we can see, the visible spectrum. Metaphorically, to intellectually or spiritually illuminate, i.e., to cast light on a subject. Astrologically, a planet's influence, as in "translation of light".

See also:
♦ Electromagnetic Spectrum ♦ Translation of Light
Light [DeVore]

(1) The imponderable agent by which objects are rendered visible to the eye;

(2) an illumination that confers mental or spiritual enlightenment.

See also:
♦ Electromagnetic Spectrum ♦ Translation of Light
Light, Collector of [DeVore]

A ponderous planet which receives the aspects of any two significators in some of their Essential Dignities. Both must be lighter planets than the Collector itself. It denotes a mediator who will interest himself in the affairs of both parties to bring to a favorable issue a desired result which could not otherwise be achieved. It is a favorable position for the reconciling of differences, quarrels, lawsuits; the bringing about of marriages and of various agreements.

See also:
♦ Aspect ♦ Essential Dignity ♦ Collection of Light
Light Planets [DeVore]

The Moon, Venus and Mercury, referring to their gravities and to their consequent swiftness of motion. The nearer a body is to its gravitational centre, the more its motion is accelerated and its gravity proportionately diminished.

See also:
♦ Sun ♦ Moon
Light Spectrum [Astro*Index]

The band of colors or wavelengths produced by passing white light through a spectroscope or spectrograph.

See also:
♦ Electromagnetic Spectrum ♦ Wave Length
Light Time Correction [Astro*Index]

One component of planetary aberration, made by determining the geometric position of the object at an earlier moment (To) when light left the body, the geometric position of the observer at the moment (T) when light arrived, computing the geometric distance (R), and iterating for the value of To, such that the equation:

     R = c(T-To) is satisfied, where:      c = velocity of light.
See also:
♦ Stellar Aberration ♦ Planetary Aberration ♦ Geometric Position
Light of Time [DeVore]

The Sun by day; the Moon by night.

See also:
♦ Sun ♦ Moon
Light, Velocity of [Astro*Index]

The rate in which electromagnetic radiation moves in a given direction.

See also:
♦ Roemer, Olaus
Light, Velocity of [DeVore]

186,270 miles per second.

See also:
♦ Roemer, Olaus
Light, Wavelength of [Astro*Index]

The distance, in the line of advance of a wave, from any one point to the next point of corresponding phase.

See also:
♦ Angstrom
Light Year [Astro*Index]

The distance that light travels in one Tropical year in a vacuum. Equal to 9.460x10[12] km = 63,240 AUs = 0.3066 parsecs. This is about 5.84 trillion miles.

See also:
♦ Tropical Year
Light Year [DeVore]

Unit of measurement of Ultra-solar system distances. A Light-year is the distance light travels in one year — at the rate of 186,000 miles per second, or about six trillion miles: 6 with 12 ciphers. Intrasolar system distances are measured in astronomical units. An astronomical Unit is the mean distance of the Earth from the Sun, about 92,930,000 miles, where it is found in April and October, at which time the Sun's light reaches the Earth in 499 seconds, or about 8 minutes. The inadequacy of this unit for ultra-solar system spaces can be seen by comparing the Pluto distance from the Earth, of 39« A.U., light from which reaches the Earth in a little over five hours, with the distance of the next closest major body beyond Pluto, the star Alpha Centauri, light from which requires 4-3 years to traverse the intervening 25 trillion miles. Yet, if anyone on Alpha Centauri, despite its relative closeness, were to attempt to observe Pluto he would find it separated from the Sun by an arc of only 1°, which means that Pluto and all the planets would be merged into the glare of the Sun, and give the appearance of an average star of the third or fourth magnitude.

See also:
♦ Tropical Year
Light Year [Munkasey M.]

The distance that light can travel in one year. Tnisis equal to about 5.84 trillion miles (9.47 Trillion Km).

See also:
♦ Stars ♦ Light, Velocity of

 

Astro*Index Copyright © 1997 Michael Erlewine

 

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