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Qué (quién) es DECLINATION - definición
![[[Right ascension]] (blue) and '''declination''' (green) as seen from outside the [[celestial sphere]].](https://commons.wikimedia.org/wiki/Special:FilePath/Ra and dec on celestial sphere.png?width=200 "[[Right ascension]] (blue) and '''declination''' (green) as seen from outside the [[celestial sphere]].")
![equator]] (green) and is positive northward (towards the top), negative southward (towards the bottom). The lines of ascension (blue) divide the sky into [[small circle]]s, here 15° apart.](https://commons.wikimedia.org/wiki/Special:FilePath/Stars and dec.png?width=200 "equator]] (green) and is positive northward (towards the top), negative southward (towards the bottom). The lines of ascension (blue) divide the sky into [[small circle]]s, here 15° apart.")
Wikipedia
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle. Declination's angle is measured north or south of the celestial equator, along the hour circle passing through the point in question.
The root of the word declination (Latin, declinatio) means "a bending away" or "a bending down". It comes from the same root as the words incline ("bend forward") and recline ("bend backward").
In some 18th and 19th century astronomical texts, declination is given as North Pole Distance (N.P.D.), which is equivalent to 90 – (declination). For instance an object marked as declination −5 would have an N.P.D. of 95, and a declination of −90 (the south celestial pole) would have an N.P.D. of 180.
