light second Definition

astronomy unit, light year, absolute magnitude, standard candle, heliometer, apparent magnitude, semidiameter, hubble law, heliometry, sidereal time, multiple star, roche limit, almucantar, metric linear unit, apolune, sidereal year, mean solar day, minute of arc, binary star, sidereal day, beamless, linear unit, apocynthion, radio interferometer, absorption band, intersidereal, tyndall effect, binary system, apastron, white dwarf, gravitational field, distance, solar day, star chart, astronomical year, evection, chromatoscope, luminous energy, circumjovial, femtometer, inferior planet, straight angle, tropical year, unit of measurement, triangulum australe, semimajor axis, curtation, pyrheliometer, interplanetary space, parsec, summer triangle, solar year, parhelic circle, solar telescope, angular unit, celestial point, perradial, heat ray, oort cloud, radio galaxy, extraterrestrial object, cosmic background radiation, picometre, decametric, nautical linear unit, minor planet, small circle, compton effect, spherometer, acronycal, cubic centimetre, terrestrial telescope, longimetry, exposure meter, nubecula, acronycally, rutilate, event horizon, myriameter, inner planet, macrometer, asteriated, major planet, giant star, solar constant, light meter, antiscian, hull down, actinic radiation, optical phenomenon, metagalaxy, redshift, paramere, angular distance, cosmic time, holophotal, radio astronomer, spectral type, astrosphere, diameter,