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Astronomical question and answer 280

 

Frank L. Preuss

 

How is the position of a star determined?

 

CelestialSphere

"Celestial Sphere
Astronomers describe the positions of objects in the sky by imagining that they are all at the same distance from the Earth, on the surface of an imaginary globe called the celestial sphere. An objectís celestial coordinates are right ascension and declination, defined in relation to the celestial poles and equator, which lie above the Earthís poles and equator. The Sunís yearly path round the sky is called the ecliptic."

"right ascension (Astronomy) One of the two coordinates, used with declination for specifying position on the celestial sphere in the equatorial coordinate system. It is the angular distance measured eastwards along the celestial equator from the vernal equinox to the intersection of the hour circle passing through the body. (It is the celestial equivalent to longitude). Its units are hours, minutes and seconds, and one hour of right ascension is 15o; the Earthís daily rotation takes the celestial sphere through 1 hour of right ascension in 1 hour of sidereal time."

"declination (Astronomy) The angular distance of a heavenly body from the celestial equator measured positively northwards along the hour circle passing through the body."

 

 

This is the end of "Astronomical question and answer 280"
To the German version of this chapter: Astronomische Frage und Antwort 280

 

 

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