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ⓘ Opposition, astronomy and astrology. Opposition is a word used in observational astronomy. It is used when two objects in the sky are on the opposite side of th ..




Opposition (astronomy and astrology)
                                     

ⓘ Opposition (astronomy and astrology)

Opposition is a word used in observational astronomy. It is used when two objects in the sky are on the opposite side of the sky when viewed from the Earth.

In particular, two planets are in opposition to each other when their ecliptic longitudes differ by 180°. When talking about a single object being in opposition, it is assumed to be opposite from the sun.

The Moon is in opposition to the Sun when it is a full moon.

The symbol of opposition is ☍.

A planet or asteroid or comet is said to be "in opposition" when it is in opposition to the Sun as seen from the Earth. This is the best time to observe a planet because:

  • it is visible almost all night, rising around sunset, culminating around midnight and setting around sunrise
  • light reflects more brightly from bodies with rough surfaces, at that angle
  • its orbit brings it closest to the Earth, making it appear bigger and brighter
                                     
  • that means the opposite of a word Additive inverse, in mathematics, taking the negative opposite of a number Opposition astronomy and astrology
  • ISBN 0 - 691 - 01196 - 6. Valery, Franz Cumont, Marie 1912 Astrology and religion among the Greeks and Romans. American lectures on the history of religions

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