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aberration according accurately added altitude angle anomaly aphelion apparent applied assumed axis beginning body calculated called Cassini circle comes comet compared computed conjunction consequently considered correction corresponding declination described determined diameter difference direction distance draw earth eclipse equal equation error excentricity fixed stars given gives greater greatest half happen hence horizon hour inclination increase interval Jupiter known LANDE latitude less light longitude manner mean mean motion measured meridian method moon moon's motion move nearly node observations opposition orbit parallax parallel passing periodic perpendicular planet pole position quantity radius refraction represent respect right ascension ring satellite Saturn seen semidiameter shadow shows side sine solar star subtract sun's supposed Tables third tion transit true varies Venus zenith