The Nautical Almanac and Astronomical Ephemeris for the Year ...order of the Lords Commissioners of the Admiralty, 1843 |
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
Aldebaran W Antares SUN Antares W Apparent Declination APPARENT NOON APPARENT PLACES Apparent Right Ascension Aquarii Aquila Arietis E Arietis Mars ASCENSION AND DECLINATION Cancri d h m Declination diameter Earth Fomalhaut Fomalhaut E Frid FRIDAY Geminor Geocentric Greenwich Mean Greenwich Transit h m s Heliocentric Hour of Long Hour of pass inverting Telescope Jupiter W Leonis Libræ LUNAR DISTANCES Mean Noon Meridian Longitude Meridian of Greenwich MONDAY Month Moon I. L. Moon II MOON'S RIGHT ASCENSION Name and Position Ophiuchi Passage Pegasi Mars Piscium Pollux W PRINCIPAL FIXED STARS R. A. Dec Regulus Spica Regulus W Right Asc Sagittarii SATELLITES OF JUPITER SATURDAY Saturn E Scorpii Semidiam Spica mg Antares Spica ng Star's Name SUN Venus SUNDAY Tauri Thur THURSDAY TRANSIT AT GREENWICH True Dist Tues TUESDAY UPPER TRANSIT Variation of Apparent Variation of Declination Variation of Right Vect Virginis WEDNESDAY
Δημοφιλή αποσπάσματα
Σελίδα 533 - ECLIPSES. In the year 1883 there will be two Eclipses of the Sun, and two of the Moon.
Σελίδα 533 - Shadow occurs at 50° from the Northernmost point of the Moon's limb towards the East. The last contact at 15°, towards the West.
Σελίδα 571 - 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 561 - TABLE II. Containing the Second Correction, (always to be. added.) Arguments: — Sidereal Time and Altitude. TABLE III.
Σελίδα 583 - Emersion (Em.) the instant of its re appearance at coming out of the shadow. They generally happen when the Satellite is apparently at some distance from the body of Jupiter, except near the opposition of Jupiter to the Sun, when the eclipse takes place near to the body of the planet.
Σελίδα 575 - Sidereal Time at Mean Noon is the angular distance of the first point of Aries, or the true vernal equinox, from the meridian, at the instant of mean noon : it is therefore the Right Ascension of the mean Sun...
Σελίδα 571 - Astronomers, with the 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 a year. An imaginary Sun, called the mean Sun, is conceived to move uniformly in the Equator with the real Sun's mean motion in Right Ascension, and the interval between the departure of any meridian from the main Sun and its succeeding return to it is the duration of the mean solar day.
Σελίδα 573 - Sun from the meridian, or the portion of time to be added to or subtracted from, (according to the precept at the head of the column,) Greenwich apparent noon to obtain the corresponding mean time at the same meridian, or the time which should be shown by a mean time clock.
Σελίδα 571 - As the time deduced from observation of the true Sun is called true or apparent time, so the time deduced from the mean Sun, or indicated by the machines which represent its motion, is denominated mean time.
Σελίδα 129 - THE SATELLITES OF JUPITER are not visible this Month, JUPITER being too near to the SUN. From Mean For correcting the Places of the Fixed Stars. 0...