The American Ephemeris and Nautical AlmanacU.S. Government Printing Office, 1872 - Nautical almanacs |
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Common terms and phrases
Antares E Antares Saturn Apparent Declination APPARENT PLACES Apparent Right Ascension Aquarii Aquilæ Fomalhaut Arietis Aldebaran ASCENSION AND DECLINATION Astr Cancri Capricorni CONJUNCTION IN R. A. Day of Month Declination North Eclipse Disapp Eclipse II Eclipse Reapp Egress 11 Egress 27 Egress Egress Egress W ELEMENTS FOR FACILITATING Ephemeris Fomalhaut E Frid Geminor Geminorum GREENWICH MEAN Horizontal Parallax Hour Angle Ingress 18 Ingress 25 Ingress W latitude Leonis LUNAR DISTANCES Mean Solar Date Meridian Passage MERIDIAN TRANSIT Midnight Moon MOON'S RIGHT ASCENSION mult Name and Position Occult OCCULTATIONS OF PLANETS Ophiuchi P. L. of Diff Pegasi a Arietis Piscium Pollux Jupiter Pollux Regulus PREDICTION OF OCCULTATIONS Right Declination Ascension Saturn a Aquilæ Saturn W Scorpii Sept Shadow Egress Sidereal Spica Antares Star's Name SUN'S Tauri Thur TRANSIT AT WASHINGTON Transit Ingress True Longitude Tues UPPER TRANSIT Venus Virginis Washington Hour Angle WASHINGTON MEAN NOON
Popular passages
Page 410 - In the year 1887 there will be four eclipses, two of the Sun and two of the Moon. I. — A...
Page 493 - Mean Time, which is perfectly equable in its increase, is measured by the motion of this Mean Sun; the latter at certain periods agrees with the real sun, then again is in advance of it, and at other times is behind it.
Page 493 - Sidereal Time. — Sidereal time is measured by the daily motion of the stars; or, as it is used by astronomers, by the daily motion of that point in the equator from which the true right ascension of the stars is counted.
Page 499 - Time, given at the end of the volume for 1871, eaves the operation of reducing degrees, (or hours) and minutes to seconds, and the reverse. As the PL of Diff. in the Ephemeris varies, the Greenwich time, found by the methods just described, may not be sufficiently exact. To correct it for such variation, or 2d difference, take the difference between the.
Page 494 - ... mean noon. The civil day begins twelve hours before the astronomical day; therefore the first period of the civil day answers to the last part of the preceding astronomical day, and the last period of the civil day corresponds to the first part of the same astronomical day.
Page 494 - The Civil Day, according to the customs of society, commences at midnight, and comprises twenty-four hours, from one midnight to the next following. The hours are counted from 0 to 12 from midnight to noon, after which they are again reckoned from 0 to 12 from noon to midnight. Thus the day is divided into two periods of 12 hours each...
Page 516 - NEWCOMB'S Investigation of the Distance of the Sun and the Elements which depend on it,\ is 8".848. The adopted Semidiameter of the Sun at the Earth's mean distance is 16
Page 494 - Ascension and Declination, and the Equation of Time. Adjoining columns contain the differences of these quantities for one hour. By multiplying this difference by the hours and parts of an hour from Greenwich apparent noon, and adding the amount to. or subtracting it from, the quantity at noon, according as that quantity is increasing or decreasing, we obtain the value of any quantity for any given Greenwich apparent time.