Handbook of Astronomy, Tom 1

altitude angle annual apparent diameter apparent magnitudes apparent motion ascer ascertained atmosphere attraction axis bodies celestial equator centre circle clouds consequently degree density depth direction disk diurnal diurnal motion earth east ecliptic edge effect electricity elevation equal explained feet firmament globe greater greatest elongation heat height hemisphere Herschel horizon increase inferior conjunction inferior planet instrument interval Jupiter latitude length less light longitude lunar lunar phases Mädler mass mean distance mean temperature meridian millions of miles moon moon's mountain move nearly object observed orbit parallax parallel passes the meridian period phenomena planet PLATE polar pole position produced quadrature quantity radiation ratio rays revolve right ascension ring rotation satellites Saturn seen snow-line solar spots star strata stratum sun's superficial superior conjunction superior planet surface synodic synodic period telescope terrestrial thermal tion Uranus vapour variation varies velocity visible wires zenith zone