Outlines of Astronomy, Volume 1

2dly altitude amount angle angular angular velocity apparent diameter appear arise ascertained astronomical atmosphere axis body calculated called cause circle clock course degree described determined difference direction disk diurnal motion earth earth's surface ecliptic equal equator equatorial equinoctial equinox error exact excentricity fixed former globe gravity greater heavens heliocentric hemisphere horizon hour angle instrument interval Jupiter latitude latter law of Kepler less light limb longitude lunar mean measure Mercury meridian micrometric moon moon's nearly node nutation observed opposite orbit parallax parallel passing perihelion period perpendicular phenomena planet polar pole portion position precession precisely proportion radius rays reckoned refraction render respect revolution revolve right ascension ring rotation round satellites Saturn seen side sidereal sidereal period situation solar spectator sphere spherical spots stars station sun's Suppose telescope tion triangle Uranus velocity vernal equinox vertical visible weight whole zenith distance