Related by context. Frequent words. (Click for all words.) 53 occultation 52 ecliptic 51 vernal equinox 50 Gregorian calendar 49 constellations 48 constellation 47 autumnal equinox 47 lunar calendar 46 equinox 46 Ophiuchus 45 Pleiades 45 Sedna 45 astronomical observations 45 winter solstice 44 spring equinox 44 cosmic microwave background 43 astrology 43 crescent moon 43 aurora 42 Perseids 42 X ray emission 42 cosmology 42 Jupiter Saturn Uranus 42 meteor shower 42 unaided eye 42 sunspot activity 42 zodiac 42 HD #b [002] 42 aurora borealis 41 ellipse 41 GRBs 41 zodiac signs 40 celestial bodies 40 Gnosticism 40 Geminids 40 zodiac sign 40 extrasolar planets 40 celestial objects 40 Deneb 40 elliptical orbit 40 sunspots 39 perigee 39 latitudes 39 Medieval Warm Period 39 supermoon 39 Betelgeuse 39 Cassiopeia 39 simplest explanation 39 liturgical calendar 39 lunar eclipses 39 COROT 38 ancient Romans 38 geomagnetic 38 Mayan calendar 38 Zoroastrianism 38 supernova remnant 38 cosmological 38 extrasolar planet 38 ancient Greeks 38 umbra 38 Saturn rings 38 summer solstice 38 WMAP 38 Aurora Borealis 38 dwarf galaxy 38 orbits 38 gamma ray bursts 38 theorem 38 XMM Newton 38 Jupiter moons 37 Scorpius 37 Little Ice Age 37 supernovas 37 elliptical galaxies 37 Leonids 37 geostationary satellites 37 interferometer 37 Sunspots 37 infrared wavelengths 37 lunar eclipse 37 sunspot 37 supernova 37 cosmologists 37 astronomy 37 Spitzer Space Telescope 36 globular clusters 36 gamma ray burst 36 optical telescopes 36 nebulae 36 Paganism 36 Judeo Christian tradition 36 ESO Very Large Telescope 36 Samhain 36 meteor showers 36 astronomers 36 supernovae 36 nebula 36 astrological 36 crescent 36 Perseid meteor shower 36 circular orbit