perihelion

perihelion, celestial equator, perigee, umbral, heliopause, capricornus, autumnal equinox, oort cloud, celestial sphere, ecliptic, orbital velocity, equator, equinox, proxima centauri, equinoxes, orbits, mesosphere, spring equinox, galactic equator, sextile, synchronous orbit, syrtis major, uranus, sidereal, steeve, photosphere, vernal equinox, perilune, annularity, annular eclipse, zodiacal light, prograde, geosynchronous orbit, phaethon, moonset, triangulum, perseids, corot, solstices, moonlet, summer solstice, milky way galaxy, geostationary orbit, moonrise, planetoid, arcsecond, lagrangian, benjamin franklin bridge, exosphere, conjunct, occultation, airglow, saturnian, magnetopause, epsilon aurigae, jupiter, redshift, andromeda galaxy, troposphere, eridanus, beta centauri, partial eclipse, puppis, heliosphere, winter solstice, cepheus, asterism, geosynchronous, tropopause, hubble constant, morning watch, comet, pleiades, asteroid belt, attic salt, betelgeuse, iapetus, interstellar space, gravitational interaction, earthshine, prime meridian, tishri, omega centauri, seedtime, jovian, parsec, trine, planets, flyby, ushant, magnetosphere, exoplanet, mimas, midheaven, ophiuchus, lutetia, sunspot, enceladus, quadrillionth, venusian, planetary nebula, achernar, chesterfield, corral, eternity, futurity, posterity, proscenium, purgatory, abode, additions, brighter, cityscape, comer, comers, conspiracies, contemporaneity, corner, courtroom, danger, dark, darkroom

apoapsis, point of apoapsis