solstices, equinox, vernal equinox, autumnal equinox, spring equinox, winter solstice, celestial equator, summer solstice, perihelion, ecliptic, aphelion, sidereal, celestial sphere, perseids, vernal, earthshine, sundials, lunar calendar, zodiacal light, galactic equator, constellations, occultation, moonrise, saturnian, perigee, equator, periodicities, tishri, candlemas day, obliquity, gregorian calendar, sunspots, lunisolar calendar, moons, sextile, candlemas, tropopause, angiosperms, asterism, moonset, uranus, precession, epochs, celestial, capricornus, samhain, photosphere, prominences, ellipse, gnomon, venusian, sunrises, kislev, umbral, uranian, magnetosphere, pleiades, triduum, heliopause, mesosphere, meteor shower, annular eclipse, celestial mechanics, deities, paschal, albedo, millenniums, jovian, algol, oort cloud, rosh chodesh, longitudes, photometry, phalguna, auroral, el nino southern oscillation, hipparchus, pagans, latitudes, baisakh, prograde, sun, lunar eclipse, milky way galaxy, sabbaths, cheshvan, airglow, orbits, planets, moonlet, chondrules, anticyclones, irradiance, moharram, lunar, theophany, phenology, ancients, photoperiod, mithraism, zoroastrianism, insolation, maxima, minima, radii, diurnal, elongations, graduations, maximum, normals, transits, alternation, altitudes, averages, isotherms, luminosities, maximums, meridians

astronomical year, equinoctial year, great year, hipparchus, platonic year, precession of the equinoxes, season, solar year, time of year, tropical year