An Introduction to Astronomy: Designed as a Text Book for the Students of Yale College

altitude angular distance aphelion apparent diameter apparent motion appear apsides astronomers axis azimuth celestial circle comet cube declination degree described determined direction disk diurnal diurnal motion earth earth's orbit earth's shadow eccentricity ecliptic equal equator equinox figure force full moon globe gravity greater heavens heliocentric Hence horizon hour inclination increased inferior conjunction inferior planets instrument Jupiter known latitude light longitude lunar mean distance measured Mercury meridian miles moon moon's orbit moves nearer nearly node oblique observations opposite parallel passing perigee perihelion period perpendicular planetary pole radius vector refraction represent respect revolution revolve right angles right ascension ring satellites Saturn seen semi-diameter side sidereal sidereal day solar solar eclipse solstice spectator sphere square star sun and moon superior conjunction superior planets supposed surface syzygies telescope tides tion transit triangle Uranus velocity Venus vernal equinox west to east