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right ascension
NOUN [ASTRONOMY.]
1.
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.
Source: Dictionary.com
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Right ascension - Wikipedia

en.wikipedia.org/wiki/Right_ascension

Right ascension (abbreviated RA; symbol α) is the angular distance measured eastward along the celestial equator from the vernal equinox to the hour circle of  ...

Right ascension

www.physics.csbsju.edu/astro/CS/CS.10.html

Term: right ascension. The stars on the celestial sphere are like cities on the globe. Cities are located on the globe using latitude and longitude. Longitude says ...

What Are Celestial Coordinates - Understanding Celestial Coordinates

www.skyandtelescope.com/astronomy-resources/what-are-celestial-coordinates/

Jul 20, 2006 ... Newcomers to astronomy can get thrown for a loop when they first encounter declination and right ascension, the terms astronomers use to ...

Lecture 1: Introduction to Astronomy 250

ircamera.as.arizona.edu/astr_250/Lectures/LECTURE_01.HTM

Right ascension is analogous to longitude, is usually measured in units of time: hours, minutes, seconds. The zero-point for right ascension is the Vernal ...

What are RA and DEC? (Intermediate) - Curious About Astronomy ...

curious.astro.cornell.edu/about-us/112-observational-astronomy/stargazing/technical-questions/699-what-are-ra-and-dec-intermediate

Jun 28, 2015 ... RA (right ascension) and DEC (declination) are to the sky what longitude and latitude are to the surface of the Earth. RA corresponds to ...

Right Ascension & Declination Astronomical Coordinate System

www.go-astronomy.com/articles/coordinate-system.htm

Right Ascension and Declination are a system of coordinates used in astronomy to determine the location of stars, planets and other objects in the night sky.

Celestial Equatorial Coordinate System - Basic Coordinates and ...

astro.unl.edu/naap/motion1/cec_units.html

The second coordinate in the celestial equatorial system is right ascension. It is analogous to (but not the same as) longitude. Much has Greenwich is the ...

Messier Objects by Right Ascension - SEDS Messier Database

messier.seds.org/dataRA.html

Messier Object Data, sorted by Right Ascension. The old Charles Messier has expressed his plan to bring out his catalog anew, ordered by right ascension; ...