The Nautical Almanac and Astronomical EphemerisH.M. Stationery Office, 1852 |
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
9 ΙΟ Aldebaran Aldebaran W Antares E Apparent Declination Apparent Right Ascension Aquarii Aquila E Arietis W ASCENSION AND DECLINATION Cancri Capricorni d h m diff Earth Eclipse Disapp Eclipse Reapp EPHEMERIS Fomalhaut E Frid Geminor Geocentric Greenwich Mean Heliocentric Hour of diameter Hour of Long Hour of pass I. U. Moon I. L. Ingress 23 Jupiter E Leonis Libræ Logarithm LUNAR DISTANCES Mean Noon Meridian Longitude Meridian of Greenwich Meridian Passage Month Moon I. U. Moon MOON'S RIGHT ASCENSION Name and Position O'II Occult Ophiuchi Pegasi W Piscium Pollux Regulus R. A. Dec Regulus E Regulus Spica Right Asc Sagittarii Saturn Pollux Saturn W Scorpii Semi Semidiam Shadow Egress Spica m Antares Spica mp Star's Name SUN Venus SUNDAY Tauri Thur THURSDAY Transit Egress True Dist Tues TUESDAY Variation of Apparent Variation of Declination Variation of Right Vect Virginis WEDNESDAY
Δημοφιλή αποσπάσματα
Σελίδα 413 - Year 1881 there will be two Eclipses of the Sun and two of the Moon, and a transit of Mercury across the Sun's disc.
Σελίδα 473 - TABLES FOR DETERMINING THE LATITUDE BY OBSERVATIONS OF THE POLE STAR OUT OF THE MERIDIAN. TABLE I. Containing; the First Correction. Argument: — Sidereal Time of Observation. Sidereal Time. Correction. Sidereal Time. Sidereal Time. Correction. Sidereal Time.
Σελίδα 487 - Chronometers are adjusted to mean solar time ; so that a complete revolution (through 24 hours) of the hour hand of one of these machines should be performed in exactly the same interval as the revolution of the Earth on its axis with respect to the mean Sun. If the mean Sun could be observed on the meridian at the instant that the clock or chronometer indicated Oh Om 0", it would again be observed there when the hour hand returned to the same position.
Σελίδα 487 - Hence it is that astronomers, with a view of obtaining a convenient and uniform measure of time, have recourse to a mean solar day, the length of which is equal to the mean or average of all the apparent solar days in the year. An imaginary Sun, called the
Σελίδα 487 - A day is the interval of time between the departure of any meridian from a heavenly body and its succeeding return to it, and derives its name from the body with which the motion of the meridian is compared. The...
Σελίδα 491 - Greenwich, the sidereal clock ought to show oh om o9, and at the succeeding return of the star, or the equinox, to the same meridian, the clock ought to indicate the same time. The sidereal time here given is that in common use among astronomers, and expresses the actual hour angle from the meridian, westward, of the true equinoctial point at the moment of observation.
Σελίδα 457 - TIME OF HIGH WATER, ON THE FULL AND CHANGE OF THE MOON, AT THE FOLLOWING PORTS AND PLACES.
Σελίδα v - The Equatorial Horizontal Parallax of the Sun, at the Earth's Mean Distance, has been taken = 8" '5776, as deduced by Professor ENCKE, from the Transits of Venus, in 1761 and 1769. {Dei- Venusdurchgang von 1769, &c. Gotha, 1824. page 108.) The Constant of Aberration = 20"
Σελίδα vii - Tables astronomiques publiées par le Bureau des longitudes de France , contenant les tables de Jupiter, de Saturne et d'Uranus , construites d'après la théorie de la mécanique céleste, par MA Bouvard,.
Σελίδα 491 - A Sidereal Clock represents the rotation of the Earth on its axis, as referred to the Stars, its hour-hand performing a complete revolution through the 24 hours in the interval between the departure of any meridian from a Star and its next return to it. At the moment that the Vernal Equinox, or a Star whose Right Ascension is...