A Compendium of Astronomy |
Other editions - View all
Common terms and phrases
altitude angle angular apparent diameter ascertained astronomers atmosphere axis called celestial circle comet constellation degree direction disk distance diurnal diurnal motion earth earth's orbit earth's shadow eccentricity equal equator equinoxes fall fixed stars force full moon globe gravity greater greatest elongation heavenly bodies heavens hemisphere Hence Herschel horizon hour inferior conjunction inferior planets Jupiter latitude learner less longitude lunar eclipse magnitude Mercury and Venus meridian miles moon's orbit mountains nearer nearly node oblique observations opposite orbit parallax parallel passing period planetary pole portions refraction represent respect revolution revolve right ascension ring satellites Saturn seen side sidereal sidereal day solar eclipse sometimes space spectator sphere spots sun and moon sun's light superior planets supposed surface synodical tance telescope tide-wave tides tion transit transits of Mercury transits of Venus tropic Uranus velocity visible west to east Zodiac Zodiacal Light