(a.) of or pertaining to astronomy; in accordance with the methods or principles of astronomy.

Atlantean Brobdingnagian Cyclopean Cynthian Gargantuan Herculean Homeric abysmal amplitudinous anagalactic asteroidal astral astrologic astrologistic astrologous astronomic astrophysical awesome boundless bulky celestial circumplanetary cislunar colossal cosmic elephantine empyreal empyrean enormous epic equinoctial extensive extragalactic galactic giant giantlike gigantic heavenly heliacal heroic huge immeasurable immense infinite intercosmic interplanetary intersidereal interstellar jumbo king-size large lunar lunary lunate lunular lunulate mammoth massive massy meteoric meteoritic mighty monster monstrous monumental mountainous nebular nebulose nebulous outsize overgrown planetal planetarian planetary planetesimal prodigious profound semilunar sidereal sizable solar spacious sphery star-spangled star-studded starry stellar stellary stupendous terrestrial titanic towering tremendous uranic vast voluminous weighty zodiacal