A Treatise on Astronomy: In which the Elements of the Science are Deduced in a Natural Order from the Appearances of the Heavens to an Observer on the Earth; Demonstrated on Mathematical Principles; and Explained by an Application to the Various Phenomena |
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Common terms and phrases
aberration altitude angle aphelion apparent motion apparent semidiameter appear ascertained astronomers axis azimuth centre circle circle of latitude co-sine comet conjunction consequently deduced described determined diameter difference disc diurnal motion earth earth's orbit ecliptic ellipsis equal equinoxes errour excentricity fixed stars geocentric given greater greatest equation Greenwich heliocentric hence horary motion horizon horizontal parallax hour hour angle inclination inferiour planets interval jupiter known latitude libration longitude lunar lunar eclipses magnitude mean anomaly mean distance mean motion mercury meridian method moon moon's nearly node noon observations opposition orbit parallax parallel passing perihelion perpendicular pole PROB proportion radius ratio refraction respect revolution right ascension right-angled satellites saturn shadow shewn sine solar star's subtracted sun's declination superiour supposed syzygies tang tangent telescope tion triangle true anomaly true place tude velocity venus whence