Web Results
right ascension
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
right ascension | Define right ascension at Dictionary.com
dictionary.reference.com/browse/right ascension
The world's most popular free online dictionary with definitions, spell check, word origins, example sentences, audio pronunciations, Word of the Day and more!

Right ascension - Wikipedia


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


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


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


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 ...


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


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 ...


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