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Alignment, great circle connecting two stars in the sky. The method of the alignments used to identify and recognize a star that is located on the extension of an alignment determined by stars notes. In astronomy, the conjunction is the planetary configuration that determines when two planets have the same longitude or the same right ascension seen from the center of the Earth.
For example with regard to the Sun-Earth-Moon system, the Moon is in conjunction with the sun to the moon, that is, when it lies between the Sun and Earth, it turns to its unlit hemisphere.
In the case of an inner planet (that is, with a distance from the lower Sun than Earth, Mercury or Venus), the conjunction can occur in two different configurations.
If the planet is in the same direction of the Earth relative to the Sun is that has an Earth configuration – inner planet – the Sun, it is said that it is in inferior conjunction; This position corresponds to the minimum distance from Earth. When, however, is in the opposite direction from the Earth than the Sun, it is said that it is in superior conjunction; This position corresponds to the maximum distance from Earth. When an outer planet is aligned to the opposite extreme from the Sun, it is said that there is a conjunction. Instead, when an outer planet is aligned with the Earth between the Sun and the planet, the planet is said in opposition. When a planet is in the lower inner or outer planet conjunction is in opposition is an apparent retrograde motion. May occur conjunctions of two planets to one another or to a planet with a star or multiple conjunctions, involving more celestial bodies. When Jupiter and Saturn are in conjunction it is said that you are in a “great conjunction”. Furthermore, if the two planets are at least approximately in opposition to the Sun is a triple conjunction occurs.
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