AstronomyD. Van Nostrand Company, 1913 - 335 Seiten |
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appearance April astronomers bright stars brightest star called centre century chapter chief stars cluster colour constellation Corona dark diameter disc discovery dist distance dome Double star E. E. Barnard Earth equatorial fact Fireball Greenwich Halley's Comet heavens Herschel idea Inferior Conjunction instrument Jupiter known Lick Observatory light lunar Lyræ magnitude Majoris Mars matter means Mercury meridian meteors miles Minor Planets Moon Moon's motion mountains naked eye naked-eye Nebula Neptune Northern Hemisphere noticed objects Observatory observer orbit Orion pass period planet PLATE Pole position question radiant point recognised Refractor regards remarkable Right Ascension ring round the Sun satellites Saturn seems seen side sidereal small telescope solar southern constellation spot Sun-spots Sun's surface Swift's Comet tail tides tion total eclipse Uranus Ursa Variable Star Venus W. H. Pickering whilst