right ascension

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noun Astronomy.

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.

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Origin of right ascension

First recorded in 1585–95

Words nearby right ascension

rightabout, right about face, right and left, right angle, right-angled triangle, right ascension, right as rain, right atrioventricular valve, right away, Right Bank, right brachiocephalic vein

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use right ascension in a sentence

I disapprove of what you say, but I will defend to the death your right to say it.
The Muslim Cop Killed by Terrorists|Michael Daly|January 9, 2015|DAILY BEAST
Everywhere I go, ‘Hey Cartman, you must like Family Guy, right?’
Trolls and Martyrdom: Je Ne Suis Pas Charlie|Arthur Chu|January 9, 2015|DAILY BEAST
Charlie ridiculed my faith and culture and I died defending his right to do so.
The Muslim Cop Killed by Terrorists|Michael Daly|January 9, 2015|DAILY BEAST
Gay marriage was the hot-button fight on the left and right.
Jeb Bush’s Unseen Anti-Gay Marriage Emails|Jackie Kucinich|January 9, 2015|DAILY BEAST

It is grandstanding for a right rarely protected unless under immediate attack.
Politicians Only Love Journalists When They're Dead|Luke O’Neil|January 8, 2015|DAILY BEAST
What need to look to right or left when you are swallowing up free mile after mile of dizzying road?
The Joyous Adventures of Aristide Pujol|William J. Locke
Mrs. Wurzel was quite right; they had been supplied, regardless of cost, from Messrs. Rochet and Stole's well-known establishment.
The Pit Town Coronet, Volume I (of 3)|Charles James Wills
She is quite true, but not wise, and your left hand must not know what your right hand is doing.
Checkmate|Joseph Sheridan Le Fanu
In Spain he was regarded as the right arm of the ultra-clericals and a possible supporter of Carlism.
The Philippine Islands|John Foreman
The thought seemed to produce the dreaded object, for next moment a large hummock appeared right ahead.
The Giant of the North|R.M. Ballantyne

British Dictionary definitions for right ascension

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 questionSymbol: α Compare declination (def. 1)

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for right ascension

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° of angular distance along the celestial equator for a total of 24 hours. See more at equatorial coordinate system.