beat, blue, clear, dull, flame, flare, grey, loom, nut, ray, read, row, scan, soar, speck, streak

aether, atlas, azure, billow, blue-black, blueish, blueness, blue air, blue sky, bluish, brighten, bright blue, clean-cut, clouding, cloudless, cut to, dark-blue, darken, daystar, defined, dog star, dusky, dyaus, expanse, heavy, hypethral, kindle, leaden, light-blue, livid, mushroom, pallid, rainbow, redden, redly, rocket, sky-blue, sky-high, skyhook, skyline, skyward, skywards, sky glow, slaty, sothis, starlike, star chart, suffuse, thirsty, tranquil, twilight, tyndall, ushas, vesper, watcher, zigzag

aestival, afterglow, atrium, blue poppy, canopus, celestial, cloudiness, clouding up, cloudlessness, cloud cover, counterglow, darkening, empyreal, empyrean, estival, evening star, gegenschein, gwydion, heavenly, heavenward, helios, hesperus, horizon, hypaethral, john tyndall, luminous, marsh gentian, meteor, milky way, morning star, mushroom cloud, orion, overcast, overhead, phosphorus, shooting star, sirius, skyrocket, skywriting, uplifting, varuna, warily

canicula, cerulean, chicken little, discernible, dyaus-pitar, fire watching, mackerel sky, schmidt camera, schmidt telescope, wild blue yonder

celestial body, gentiana pneumonanthe, heavenly body, milky way system, zodiacal light

apparent horizon, common morning glory, ionospheric wave, milky way galaxy, sensible horizon, visible horizon