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right ascension
noun
- the arc of the celestial equator measured eastward from the vernal equinox to the foot of the great circle passing through the celestial poles and a given point on the celestial sphere, expressed in degrees or hours.
right ascension
noun
- astronomy the angular distance measured eastwards along the celestial equator from the vernal equinox to the point at which the celestial equator intersects a great circle passing through the celestial pole and the heavenly object in question 伪 Compare declination
right ascension
- The position of a celestial object east of the vernal equinox along the celestial equator . Right ascension is measured in hours, minutes, and seconds from the vernal equinox (0 hours) to the point where a great circle drawn through the object and the north and south celestial poles intersects the celestial equator. Each hour corresponds to 15掳 of angular distance along the celestial equator for a total of 24 hours.
- See more at equatorial coordinate system
亚洲网紅露点 History and Origins
Origin of right ascension1
Example Sentences
But the flight control team can read out data describing the orientation of the telescope 鈥 for example, 鈥32 degrees right ascension, 12 degrees declination.鈥
This event is also a conjunction, which in astronomy means that the planets share the same right ascension.
By adjusting the right ascension of the plane ABC and rotating the axis with the angular velocity of the sun, it follows that BC will be the direction of the solar rays throughout the day.
Sir John Herschel, who followed up the stellar researches of his father, Sir William, in great detail, places the north pole of the Galactic plane in declination 37 degrees N., and right ascension 12 h.
The measurements that correspond in astronomy to terrestrial latitude and longitude are called declination and right ascension and are obviously made with reference to the celestial equator, not the ecliptic.
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