A Study of the Sky

Andromeda appear Arcturus astronomer atmosphere axis beautiful Betelgeuse bodies Boötes bright brighter brightest called Cassiopeia cause celestial sphere changes chromosphere circle clock clouds cluster color comet composed constellation corona crater dark diameter Dipper disc distance double star earth eclipse equator faint stars fixed stars glass glowing half Harvard College Observatory heat heavens Hercules horizon inferior conjunction instrument Jupiter lens lies light line from Polaris look lunar Lyræ Mars masses measure meridian meridian circle meteorite meteors miles Milky minute Mizar moon moon's motion move Mythology naked eye nearly nebula night observations observatory opera-glass Ophiuchus orbit Orion passes photosphere planet Pleiades Polaris portion prolonged Queries revolution revolve right ascension ring rotation Saturn seen shadow shining shower Sirius small telescope solar spectra spectroscope spectrum spider-web spot sun-spots sun's sunlight surface tail tains theory tion turned Uranus Venus visible