Celestial horizon, one axis of the altazimuth coordinate system. It is the great circle on the celestial sphere midway between the observer's zenith and nadir; it divides the celestial sphere into two equal hemispheres. The observer may be unable to see all the stars that lie above his celestial horizon because of obstructions such as buildings, trees, or mountains; he may be able to see some stars that lie below his celestial horizon because of atmospheric refraction.
Showing posts with label celestial horizon. Show all posts
Showing posts with label celestial horizon. Show all posts
Subscribe to:
Posts (Atom)
POPULAR POSTS
-
Comet, a small celestial body consisting mostly of dust and gases that moves in an elongated elliptical or nearly parabolic orbit around the...
-
Standard time, civil time used within a given time zone. The earth is divided into 24 time zones, each of which is about 15° of longitude w...
-
Star (astronomy), massive shining sphere of hot gas . Of all the stars in the universe , our Sun is the nearest to Earth and the most exten...