The Principles of Hydrostatics: Designed for the Use of Students in the UniversityJ. Smith, 1820 - 151 σελίδες |
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
altitude angle aphelion apogee 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 greater greatest heat hence Herschel horary motion horizon horizontal parallax hour hour angle immersed inches increase inferior conjunction interval Jupiter latitude longitude lunar eclipse magnitude mean motion mercury meridian meridian altitude moon moon's move nearly node observed opposition orbit orifice parallax parallel particles passes perihelion perpendicular phænomena 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
Δημοφιλή αποσπάσματα
Σελίδα 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.
Σελίδα 233 - ... and therefore there is a greater probability of seeing a lunar than a solar eclipse. Since the moon is as long above the horizon as below, every spectator may expect to see half the number of lunar eclipses which happen.
Σελίδα 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.
Σελίδα 208 - If the plane of the moon's orbit coincided with the plane of the ecliptic, there would be an eclipse at every...
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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...
Σελίδα 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.
Σελίδα 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.