Astronomy |
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altitude amount angle angular distance apparent astronomers average axis binary binary stars body celestial equator celestial pole celestial sphere centimeter comet Consequently constellation craters crosses the meridian declination density determined diameter direction diurnal motions double star earth earth's atmosphere eastward eclipse Epsilon Lyrae equal equatorial equinox eyepiece fact focal plane galactic galaxy globular clusters gravity horizon interval Jupiter kilometers per second known latitude laws of motion length Lick Observatory light light-years luminosity lunar magnitude Mars mass mean solar measured meteorites meteors miles Milky moon Mount Wilson Observatory move nearly nebulae number of stars object oblate observer orbit Orion parallax period photograph planetary planets position radiation rays refraction relative respect revolution revolve right ascension rotation satellites sidereal solar system spectral classes spectroscopic spectrum spherical sun's Suppose surface synodic month telescope temperature theory tion velocity visible Yerkes Observatory zenith