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(astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth absolute magnitude
(astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases accretion
(astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac alignment , conjunction
(astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun) anomaly
(astronomy) the point in an orbit farthest from the body being orbited apoapsis , point of apoapsis
altar in astronomy ara
(astronomy) the rising of a star above the horizon ascension
(astronomy) a cluster of stars (or a small constellation) asterism
branch of astronomy that studies the motion of natural and artificial bodies in space astrodynamics
branch of astronomy that deals with the measurement of the position and motion of celestial bodies astrometry
physicist who studies astronomy astronomer , stargazer , uranologist
branch of astronomy concerned with the physical and chemical properties of celestial bodies astrophysics
(astronomy) the equinoctial point that lies in the constellation of Virgo autumnal equinox
(astronomy) the common center of mass around which two or more bodies revolve barycenter
(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion canal
(astronomy) the angular distance of a celestial body north or south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere celestial latitude , dec , declination
(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and celestial longitude , RA , right ascension
branch of astronomy concerned with the application of Newton's laws of motion to the motions of heavenly bodies celestial mechanics
Alexandrian astronomer who proposed a geocentric system of astronomy that was undisputed until Copernicus (2nd century AD) Claudius Ptolemaeus , Ptolemy
(astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed coma
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