An Elementary Treatise on Astronomy: In Two Parts. The First Containing a Clear and Compendious View of the Theory; the Second, a Number of Practical Problems. To which are Added, Solar, Lunar, and Other Astronomical TablesE. C. & J. Biddle, 1854 - 477 páginas |
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Términos y frases comunes
affirmative altitude apparent diameter ARGUMENT ascension and declination astronomical axis body called celestial sphere centre circle comet computed consequently corrected corresponding Cotang Diff difference disc diurnal motion dominical letter earth eclipse equal equator equatorial parallax Evection fixed star formulæ full moon geocentric greatest Greenwich heliocentric Hence horizon horizontal parallax hour angle hourly motion hourly variation interval Jupiter logarithm longitude and latitude mean anomaly mean longitude Mercury meridian motion in longitude Nautical Almanac nearly node nutation obliquity observed obtained parallax parallel perigee perihelion period perpendicular planet pole position quantities radius vector refraction retrograde motion revolution right ascension satellites semidiameter shadow sidereal sine solar subtract sun's longitude sun's mean surface tang tangent telescope tion triangle true true longitude Venus vernal equinox visible zenith distance
Pasajes populares
Página 17 - The azimuth of a body is the arc of the horizon intercepted between the north or south point of the horizon, and a vertical circle passing through the body.
Página 14 - ... by an ether diffused through space ; but if so, how happens it that the planets also have not been retarded ? This the author attempted to show might be the case, although the phenomenon might pass unobserved.
Página 79 - The squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.
Página 75 - Year, and consists of 365 days, в hours, 9 minutes, and 9. 6 seconds, which is invariable. The Tropical Year is the interval between two consecutive returns of the Sun to the Vernal Equinox.
Página 112 - Hence, t — 0/,nn — -, -r\ 8600 — (m — m') is given in the Nautical Almanac for every day in the year, It may easily be found for any other meridian by proportion.
Página 11 - Uranus, and Neptune. Five of these planets, namely — Mercury, Venus, Mars, Jupiter, and Saturn are visible to the naked eye, and were known to the ancients. Uranus, the Asteroids, and Neptune have been discovered in modern times by the aid of the telescope ; and there may be others yet undiscovered.
Página 100 - That node where the planet passes from the south to the north side of the ecliptic, is called the ascending node ; and the other is the descending node.
Página 16 - The declination is reckoned north or south, according as the body is on the north or south side of the equator.
Página 107 - These phases prove conclusively that the moon shines by light borrowed from the sun. The interval from one new moon to the next new moon is called a lunation, or lunar month. It is evidently the same as a synodical revolution of the moon.
Página 17 - The Altitude of a heavenly body is the arc of a vertical circle, intercepted between the horizon and the centre of the body.