Light-year · Astrological definition of Light-year · Astrology Encyclopedia  ·  June 12, 2024, 19:42 GMT
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Light-year - Astrology Encyclopedia

Definition of Light-year 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. Intra-solar 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.

(Nicholas deVore - Encyclopedia of Astrology)

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