The American Ephemeris and Nautical AlmanacU.S. Government Printing Office, 1894 - Nautical almanacs |
Contents
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Common terms and phrases
Aldebaran Aldebaran E Antares Antares W Apparent Declination apparent noon APPARENT PLACES Apparent Right Ascension Aquarii Aquilæ Arietis W ASCENSION AND DECLINATION Ascension Declination Hor Cancri Capricorni Day of Month Decl Declination North declinations are increasing Diff.for Draconis eclipse Eq'x of Jan Fomalhaut Fomalhaut W Frid Geminorum GREENWICH MEAN NOON h m h m Heliocentric Horizontal Parallax II.I July June Latitude Leonis Logarithm LUNAR DISTANCES Mean Eq'x Mean Solar Date Meridian Passage Midnight Minute MOON'S RIGHT ASCENSION Name and Direction Ophiuchi P. L. of Diff Pegasi Pegasi W Piscium Pollux Pollux E Regulus Regulus E Right Declina Sagittarii SATURN Scorpii Semi Semidiameter Sept Sidereal south declinations Spica E SUN W Tauri Thur tion North TRANSIT AT WASHINGTON True Equinox True Longitude Tues UPPER TRANSIT Ursa Minoris VENUS Virginis WASHINGTON MEAN ΙΟ ΙΟΙ
Popular passages
Page 497 - A Solar Day is the interval of time between two successive transits of the sun over the same meridian; and tho hour-angle of the sun is called Solar Time.
Page 502 - XII contain The Moon's Right Ascension and Declination, for each day and hour of Greenwich mean time. They are accompanied with columns of differences for one minute, which are also given at each hour. The Greenwich mean time, which is required for taking out these quantities, may be taken from a well-regulated chronometer, or obtained by applying the longitude converted into time, to the local mean time of the observer.
Page 504 - ... next below it. In the case of Mercury, this intermediate date is mean noon of the day immediately following ; in the case of Venus, Mars, Jupiter, and Saturn, it is mean noon of the second day following ; and in the case of Uranus and Neptune, mean noon of the fourth day following. Pages 264 — 271 contain the rectangular co-ordinates of the centre of the sun, referred to the centre of the earth as the origin, and to the true equator and equinox of each date as the circle and point of reference....
Page 526 - The principal computations of the Ephemeris have been distributed in the following manner: — The ephemeris of the Sun was computed by Mrs. EB DAVIS; the Moon's longitude...
Page 507 - In case they would have differed, the minute which would have been numerically larger is diminished by one, and the seconds increased by sixty, so that there is always a correspondence between the two numbers. The hourly motions in right ascension and declination are given for the moment of mean noon, but may be regarded as having the same values for apparent noon. The Equation of Time for Apparent Noon is the correction to be applied to apparent time in order to obtain mean time. It is, therefore,...
Page 503 - ... of these, the hours of Greenwich time over it, and the PL of Diff. between them. Find the difference between the true distance and the distance taken from the Almanac; and from the proportional logarithm of this difference,, as found in the Navigator {Table 45), subtract the PL of Diff.
Page 521 - The angle 0, needed in reducing meridian observations, is the angle which the arc of the great circle from the planet to the sun, makes with the arc from the planet toward the west, reckoned in the direction west, north, east, south. This position-angle is reckoned from o° to 360°, as in the measurement of double stars, the planet taking the place of the central star. But its measure is 90° greater than that of a double star. We may also regard 0 as expressing the angle which the line of cusps...
Page 502 - ... as they would appear to an observer at the centre of the earth. They are given for every third hour of Greenwich mean time, beginning at noon; the dates are therefore astronomical. All the distances that can...
Page 525 - The elements of eclipses of the sun and occultations of stars by the moon are given in accordance with BESSEL'S method, using the special forms in CHAUVENET'S Spherical and Practical Astronomy. The...
Page 523 - NEWCOMB'S fundamental standard in the catalogue attached to the Washington Observations for 1870, Appendix II, with the following exceptions : The right ascensions of the 48 circumpolar stars north of 60° north declination are from Dr. GOULD'S Standard Places of Fundamental Stars, second edition, United States Coast Survey Office, 1866. Of the twelve stars south of 50° south declination, the positions of ß Hydri, a Trianguli Australis, and a Octantis, have been corrected from data furnished by...