The American Ephemeris and Nautical AlmanacU.S. Government Printing Office, 1857 |
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Aldebaran E Antares W Apparent Declination APPARENT PLACES Apparent Right Ascension Aquarii Aquilæ Fomalhaut Arietis Aldebaran ASCENSION AND DECLINATION Astr CALCULATION OF OCCULTATIONS Day of Month Eclipse Disapp Eclipse II Eclipse Reapp Egress 12 ELEMENTS FOR FACILITATING Ephemeris FACILITATING THE CALCULATION Fomalhaut E Geminor GREENWICH MEAN Ingress 12 Ingress 23 ington Mean Leonis Limiting Parallels LUNAR DISTANCES Mars Mean Solar Meridian Passage MERIDIAN TRANSIT Midnight MOON MOON'S RIGHT ASCENSION Nachr Name and Position Name and R.A. NOON AND MERIDIAN OCCULTATIONS OF PLANETS Ophiuchi P. L. of Diff P. L. of IXh Parallax PLANETS AND STARS Pleiadum 14 Pollux Saturn PRINCIPAL FIXED STARS R.A. In Dec R.A. of Star Regulus W Sagittarii Saturn Regulus Scorpii Semi Shadow Ingress Sidereal Day Sidereal Oh Spica Antares Star's Name SUN'S Tauri Thur TRANSIT AT WASHINGTON Transit Ingress True LONGITUDE Tues UPPER TRANSIT WASHINGTON MEAN WASHINGTON MERIDIAN
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Страница 391 - In the year 1883 there will be two Eclipses of the Sun, and two of the Moon. I. A partial Eclipse of the Moon, April 22, invisible in the united States except on the Pacific Coast.
Страница 493 - ... of the sun is called Solar Time. This is the most natural and direct measure of time. But the intervals between the successive returns of the sun to the same meridian are not exactly equal, owing to the varying motion of the earth around the sun, and to the obliquity of the ecliptic.
Страница 493 - THE greater portion of this Ephemeris, embracing the positions of the sun and moon; the distances of the moon from the centres of the sun and the four most conspicuous planets, and from certain fixed stars; the ephemerides of the planets Mercury, Venus, Mars, Jupiter, and Saturn, is designed for the special use of navigators.
Страница 494 - The Astronomical Day commences at noon on the civil day of the same date. It also comprises twenty-four hours; but they are reckoned from 0 to 24, and from the noon of one day to that of the next following. The...
Страница 443 - Emersion below the horizon of Washington. The Angles of Position, for the points of contact, are for direct vision, and are reckoned from the Moon's North Point and from its Vertex towards the West.
Страница 494 - January 9th, 2 h , astronomical time. The rule, then, for the transformation of civil time into astronomical time is this: — If the civil time is marked AM, take one from the day and add twelve to the hours, and the result is the astronomical time wanted...
Страница 513 - Mr. HUGH BREEN'S results contained in his paper On the Corrections of LINDENAU'S Elements of Mars, published in the Memoirs of the Royal Astronomical Society, Vol. XX., have also been discussed and applied ; and LE VERRIER'S sreular variations of the elements are likewise adopted.
Страница 500 - If the instant for computation were correctly chosen at the time of beginning or end of the eclipse, m would be exactly equal to a. If m is not equal to a, the instant for a new computation, and which will be an approximation to the actual time of beginning, may be found by adding to the preceding time of computation an interval t, which may be obtained in seconds by the formulae log. м'= 1.88187 log. Я'= 1.3757 a' = A
Страница 496 - XVin. of each Month. Lunar Distances. — These pages contain, for every third hour of Greenwich mean time, the angular distances, available for the determination of the longitude, of the apparent centre of the Moon from the Sun, the larger plane.ts and certain stars as they would appear from the centre of the Earth. When a Lunar Distance has been observed on the surface of the Earth, and...