prime meridian Definition

celestial equator, equator, ecliptic, magnetic pole, easterly, meridian, northerly, southeasterly, equatorial, greenwich mean time, landmass, line of longitude, celestial sphere, longitudes, galactic equator, equilateral triangle, isosceles triangle, aphelion, angular distance, longitude, syrtis major, antipodal, umbra, capricornus, asterism, oort cloud, geoid, promontories, lagrangian, ellipse, sidereal, heliopause, latitudinal, omega centauri, antarctic continent, perihelion, monoceros, vernal equinox, autumnal equinox, triangulum, crescent, latitude, earthshine, biogeographic, drake passage, planetoid, tyrrhenian sea, iapetus, landmasses, eratosthenes, doppler effect, zodiacal light, edmond halley, photosphere, proxima centauri, solstices, celestial pole, ushant, equinox, anticyclonic, radians, drumlin, equidistance, equinoxes, blackbody, isobars, planitia, ithaki, meridional, isotherms, cepheus, icefield, algol, gnomon, ross ice shelf, sunward, astrometry, craton, equinoctial circle, centroid, horsehead nebula, polar, corot, antarctic peninsula, annular eclipse, magnetic north, subarctic, unpolarized, nebulosity, supercontinent, jovian, terra incognita, chondrites, boson, kerguelen, dipolar, right ascension, hadrosaurus, datum, milky way galaxy,