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altitude angle aphelion apparent place appears Astronomers atmosphere axis barometer body called Cassini circle comet computed conjunction consequently declination density describe determined diameter difference distance diurnal motion earth eclipse equal equator excentricity fixed stars Flamstead fluid force gives glass greater greatest heat hence Herschel horary motion horizon hour hour angle immersed inches increase inferior conjunction interval Jupiter latitude libration longitude magnitude mean motion mercury meridian meridian altitude moon moon's move nearly node observed opposition orbit orifice parallax parallel particles passes perihelion perpendicular phaenomena planet pole pressure PROP proper motion quantity refraction resistance revolution revolve right ascension ring rise satellite Saturn semidiameter shadow side sine solar specific gravity spots sun's supposed surface telescope tion Trig true anomaly true longitude true place tube tude umbra varies velocity Venus vessel weight wind zenith
Página 284 - Observer' at a salary of 100£ per annum, his duty being 'forthwith to apply himself with the most exact care and diligence to the rectifying the tables of the motions of the heavens and the places of the fixed stars, so as to find out the so much desired longitude of places for the perfecting the art of navigation.
Página 267 - ... in diameter. The star is perfectly in the centre, and the atmosphere is so diluted, faint, and equal throughout, that there can be no surmise of its consisting of stars ; nor can there be a doubt of the evident connection between the atmosphere and the star. Another star not much less in brightness, and in the same field with the above, was perfectly free from any such appearance.
Página 208 - If the plane of the moon's orbit coincided with the plane of the ecliptic, there would be an eclipse at every...
Página 150 - ... it had a degree of brightness about as strong as that with which such a coal would be seen to glow in faint daylight.
Página 261 - ... sixteenth century Kepler discovered a new star near the heel of the right foot of Serpentarius, ' so bright and sparkling that it exceeded any thing he had ever seen before.
Página 208 - An eclipse is a partial, or total privation of the light of the sun or moon. An eclipse of the sun is caused by the interposition of the moon between the earth and the sun, and consequently must happen when the inoon is in conjunction with the sun, or at the new moon.
Página 230 - ... the sun was just coming out, a long and very narrow streak of a dusky but strong red light seemed to colour the dark edge of the moon...
Página 227 - ... seconds of time ; then part of the Sun's disc appeared all of a sudden, as bright as Venus was ever seen in the night ; nay, brighter ; and in that very instant gave a light and shadow to things as strong as the Moon uses to dod.
Página 218 - ... red color. An eclipse of the moon arising from a real deprivation of light, must appear to begin at the same instant of time to every place on that hemisphere of the Earth, which is next the moon. Hence, it affords a ready method of finding the longitudes of places upon the Earth's surface.