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1st magnitude 2nd magnitude Accompany a Course activities Alpha Andromeda appear to move ascension and declination astronomy azimuth Beta Betelgeuse brightest celestial equator celestial sphere circle nearest upper Copernicus Course in Earth craters data sheet DEC CONSTELLATION OBJECT degrees per hour Delta Determine the hour diameter Dipper distance earlier or later earth science equinoxes eyepiece field of view focal length Galileo Gamma Greatest elongation east greatest western elongation horizon hour circle nearest inferior conjunction Jupiter Jupiter's latitude lens locate Mare motion nearest upper transit Nebula noon sun Note opposition orbit Orion period of revolution phases of Venus Planetary Configurations section Polaris Pole R A DEC CONSTELLATION ray system reference stake refractor retrogression right ascension rotate satellite Saturn Selenography shadow sidereal period solar noon solar system star charts sun's sunrise sunspots superior conjunction superior planet synodical period telescope transit and record Ursa visible World Almanac Zeta