Astronomy |
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altitude amount angle angular distance apparent astronomers axis binary binary stars bodies celestial equator celestial pole celestial sphere centimeters comet Consequently constellation craters crosses the meridian declination density determined diameter direction diurnal motions double star earth earth's atmosphere eccentricity equal equatorial eyepiece fact focal plane galaxy gravity greater horizon interval Jupiter kilometers known latitude law of gravitation laws of motion length Lick Observatory light light-years lunar eclipse magnitude Mars mass mean solar measured Mercury meteorites meteors month moon Mount Wilson Observatory move nebulae Newton object oblate observer orbit passes period phenomena photograph planetary planetoids planets position radiation rays refraction relative respect revolution revolve right ascension rotation satellites Saturn sidereal solar eclipses solar system spectral spectral Class spectroscopic spectrum spherical sun's Suppose surface synodic month telescope temperature theory tides tion velocity Venus visible Yerkes Observatory zenith