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O que (quem) é right ascension - definição
Right ascension
![How '''right ascension''' got its name. Ancient astronomy was very concerned with the rise and set of celestial objects. The ''ascension'' was the point on the [[celestial equator]] (red) which rose or set at the same time as an object (green) on the [[celestial sphere]]. As seen from the equator, both were on a [[great circle]] from pole to pole (left, ''sphaera recta'' or right sphere). From almost anywhere else, they were not (center, ''sphaera obliqua'' or oblique sphere). At the poles, objects did not rise or set (right, ''sphaera parallela'' or parallel sphere). An object's right ascension was its ascension on a right sphere.<ref>Blaeu (1668), p. 40–41.</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/Old RA diagram.png?width=200 "How '''right ascension''' got its name. Ancient astronomy was very concerned with the rise and set of celestial objects. The ''ascension'' was the point on the [[celestial equator]] (red) which rose or set at the same time as an object (green) on the [[celestial sphere]]. As seen from the equator, both were on a [[great circle]] from pole to pole (left, ''sphaera recta'' or right sphere). From almost anywhere else, they were not (center, ''sphaera obliqua'' or oblique sphere). At the poles, objects did not rise or set (right, ''sphaera parallela'' or parallel sphere). An object's right ascension was its ascension on a right sphere.<ref>Blaeu (1668), p. 40–41.</ref>")
!['''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 increases eastward (towards the left). The lines of right ascension (blue) from pole to pole divide the sky into 24 hours, each equivalent to 15°.](https://commons.wikimedia.org/wiki/Special:FilePath/Stars and ra.png?width=200 "equator]] (green)) and increases eastward (towards the left). The lines of right ascension (blue) from pole to pole divide the sky into 24 hours, each equivalent to 15°.")
ASTRONOMICAL EQUIVALENT OF LONGITUDE
Right Ascension; Right assention; Right assension
Right ascension (abbreviated RA; symbol ) is the angular distance of a particular point measured eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point in question above the earth.
right ascension
ASTRONOMICAL EQUIVALENT OF LONGITUDE
Right Ascension; Right assention; Right assension
¦ noun Astronomy position measured along the celestial equator, expressed in hours, minutes, and seconds.
Ascension Day
![Syriac Orthodox Church]]](https://commons.wikimedia.org/wiki/Special:FilePath/Ascension2007-04.jpg?width=200 "Syriac Orthodox Church]]")
CHRISTIAN RELIGIOUS HOLIDAY
Ascension Day; Ascension Thursday; Ascension day; Ascensiontide; Solemnity of the Ascension of the Lord; Spasovdan; Himmelfahrt
¦ noun the Thursday forty days after Easter, on which Christ's Ascension is celebrated in the Christian Church.
