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Andromeda Arcturus astronomer atmosphere axis belt Betelgeuse bodies bright stars camera celestial equator celestial pole CELESTIAL SPHERE centre circle cloud cluster comet constellation corona crater dark diameter Dipper disc distance drawing Drawn by F. S. earth east ecliptic edge exposure F. S. Smith faint flashlamp GYRO-COMPASS hemisphere horizon inches Jupiter left-hand picture Lick Observatory light-years look Lowell Observatory magnitude Mercury miles per second Milky million miles minutes months moon motion Mount Wilson Observatory moves naked eye named nebula nebulous matter Neptune night object observe orbits Orion path Percival Lowell photograph was taken photosphere planet polar Pole Star portion position prominences RELATIVE SIZES revolves rings rotates round satellite Saturn seen shadow shape shown in Fig small telescope solar system space spots sun appears SUN-SPOT sun's surface tail TAKEN WITH VIOLET Taurus trails travellers turned Uranus Ursa Major Venus winter wonderful Yerkes Observatory