Astronomy |
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altitude amount angle angular distance apparent astronomers axis binary binary stars bodies brightness celestial equator celestial pole celestial sphere centimeter circle comet Consequently constellation craters crosses the meridian declination density determined diameter direction diurnal diurnal motions double star earth earth's atmosphere eccentricity equal equatorial equinox eyepiece fact faint first-magnitude focal plane galaxy gravity greater horizon interval Jupiter kilometers known latitude law of gravitation Lick Observatory light lunar eclipse magnitude Mars mass mean solar measured Mercury meteorites meteors miles moon motion Mount Wilson Observatory move nearly nebulae Neptune Newton object observer orbit passes perihelion photograph planet planetary planetoids polar position probably radiant energy radiation rays refraction relatively respect revolve right ascension satellites Saturn seen sidereal solar eclipses solar system spectroscope spectrum sun's Suppose surface synodic synodic month synodical period telescope temperature theory tides tion Uranus velocity Venus visible wave-lengths Yerkes Observatory zenith