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FIGURE PAGE Yerkes Observatory
Apparent Places of Stars on the Celestial Sphere
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according accurate altitude amount angle appears asteroids astronomical atmosphere attraction average axis body bright calculated called celestial circle comet computed correction declination density determined diameter direction disk distance earth eclipse effect equal equator error evidence exactly fall feet follows force four give given gravity greater half horizon hour increase interval Jupiter known latitude length less light longitude lunar markings Mars mass mean measured meridian meteors method miles minutes month moon moon's motion moving nearly object observations Observatory opposite orbit parallax passes perihelion period perturbations photograph planet pole position possible present probably produced reflected regions relative ring rotation satellites seen shadow side sidereal solar star sun's surface telescope theory tides tion transit units usually varies Venus visible whole zenith