proper motion Definition

inferior planet, sidereal time, major planet, radial velocity, evection, circumjovial, star chart, minor planet, superior planet, inner planet, siderostat, sidereal day, giant planet, binary star, sidereal year, intersidereal, solar telescope, astronomical year, celestial body, sabianism, heliometer, uranoscopy, chromatoscope, midnight sun, binary system, acronycal, absolute magnitude, planet, subsolary, tellurion, extraterrestrial object, solar year, solar day, parhelic circle, multiple star, celestial sphere, hubble law, superlunar, apojove, cometarium, apocynthion, interplanetary space, sun, radio astronomer, almucantar, white dwarf, acronycally, telespectroscope, sabaism, tropical year, ecliptic, apolune, giant star, oort cloud, geoselenic, astrognosy, orbital plane, moon, orbit, moonward, astrophobia, proxima centauri, celestial, outer planet, gravitational field, sidereal, triangulum australe, planetary, astroscopy, uranography, cepheid variable, equinoctial circle, sidereous, regrede, extrasolar, celestial equator, lunistice, orbitar, zodiacal light, equinoctial point, summer triangle, astrosphere, firmamental, little bear, apparent magnitude, stelliform, interplanetary medium, cosmic time, larmor precession, meteoroscope, uranology, spectrohelioscope, heliometry, heliology, astrography, apastron, antiscian, sunblink, selenodesy, lucifugous,