The American Ephemeris and Nautical AlmanacU.S. Government Printing Office, 1894 |
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Common terms and phrases
Apparent Declination APPARENT PLACES Apparent Right Ascension Aquarii Aquilæ Fomalhaut Arietis Aldebaran ASCENSION AND DECLINATION beginning Cancri Capricorni column computed CONJUNCTION d h m Day of Month Decl Direction of Object eclipse ELEMENTS Equation Fomalhaut a Pegasi Frid Geminorum given GREENWICH MEAN NOON Hour hourly July June JUPITER Latitude Leonis Logarithm longitude LUNAR DISTANCES MARS Mean Solar Date Meridian Passage Midnight Minute Month moon MOON'S RIGHT ASCENSION Motion Name and Direction North OCCULTATIONS P. L. of Diff Pass Pegasi a Arietis Piscium planet Polar Pollux Pollux JUPITER Pollux Regulus Reduc Right Declination Ascension Sagittarii Scorpii Semi Semidiameter Sept Sidereal South Spica SATURN Antares stars Subtracted SUN'S Table Tauri Thur TRANSIT AT WASHINGTON Tues UPPER TRANSIT Ursa Minoris VENUS Virginis WASHINGTON MEAN
Popular passages
Page 490 - ... used for greater precision. Page XII contains also the Phases of the Moon and the dates of the Moon's Perigee and Apogee, or least and greatest distances from the earth. Pages...
Page 485 - A Solar Day is the interval of time between two successive transits of the sun over the same meridian ; and the hour-angle of the sun is called Solar Time.
Page 493 - Equinoxes is really the astronomical nutation; that given In Longitude is the correction to be applied to the longitude of the body referred to the mean equinox, in order to obtain that longitude as referred to the true equinox. When the correction is positive, the true longitudes are greater than those referred to the mean equinox; while the contrary is true when the correction has the negative sign. The equation In RA is equal to that in longitude, multiplied by the cosine of the obliquity of the...
Page 486 - The sidereal hours are counted from о to 24, commencing with the instant of the passage of the true vernal equinox over the upper meridian, and ending with its return to the same meridian.
Page 486 - January gth, 2h, 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...
Page 492 - The positions are referred to the equator and true equinox of the date, and corrected for aberration ; they are, therefore, apparent positions. All the data except meridian passage are given for the moment of Greenwich mean noon. The column Meridian Passage gives the hour, minute and tenth of that passage of the planet over the meridian of Greenwich which occurs next after the noon of the date. The right ascension and declination of a planet are required whenever it has been observed for time, latitude...
Page 491 - ... observed on the same day, are grouped together under that date ; and the columns are read from left to right, across both pages of the same opening. The letter W. or E. is affixed to the name of the sun, planet or star, to indicate that it is on the west, or east side of the moon. An observer on the earth's surface having measured a lunar distance, corrected it for errors of his instrument and for the...
Page 491 - Navigator (Table 45}, subtract the PL of Diff. taken from the Almanac. The result is the proportional logarithm of an interval of time to be added to the hours of Greenwich time, taken from the Almanac, when the earlier Almanac-distance is used; to be subtracted from the hours of Greenwich time, when the later Almanac-distance is used.
Page 239 - The sign + prefixed to the hourly change of declination indicates that north declinations are increasing and south declinations are decreasing.
Bibliographic information
| Title | The American Ephemeris and Nautical Almanac |
| Author | United States Naval Observatory. Nautical Almanac Office |
| Publisher | U.S. Government Printing Office, 1894 |
| Original from | Harvard University |
| Digitized | 20 Jul 2007 |
| Export Citation | BiBTeX EndNote RefMan |