The American Ephemeris and Nautical AlmanacU.S. Government Printing Office, 1961 |
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Common terms and phrases
Apparent Declination Hour Apparent Right Ascension Ascension Apparent Declination Ascension FOR Oh Astr Astrometric Astrometric 1950.0 App Astronomical Besselian d h m Date Apparent Right Day Numbers Declination h h m Declination Hour Apparent diam disk Earth Ephem Ec.D Ec.R eclipse EPHEMERIS FOR PHYSICAL EPHEMERIS TIME Apparent EPHEMERIS TIME Date EPHEMERIS TIME MEAN eris Transit h m eter True Distance geocentric Greenwich Mean h m h m h m h m s h m S h heliocentric hour angle Hour Apparent Right HOUR OF EPHEMERIS Julian Date July June Jupiter Longitude Latitude MEAN EQUATOR mean equinox mean solar MERIDIAN OF GREENWICH Moon nutation Oc.D Oc.R Oh EPHEMERIS orbit parallax Photographic Magnitude PHYSICAL OBSERVATIONS planet Point of Aries position angle Right Ascension Apparent Right Ascension Declination Right Ascension February satellites Sept Sh.E Sh.I Tr.E Tr.I Univ University Observatory ΙΟ
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Page iv - Contains the ephemeris of Universal and Sidereal Times, the ephemerides of the Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune, the geocentric ephemerides of Ceres, Pallas, Juno, Vesta and Pluto, the nutation in longitude and obliquity, the Day Numbers, and the Phenomena. This volume also contains data on mean places of stars; eclipses of the Sun and Moon; ephemerides for physical observations of the Sun, Moon, and planets; ephemerides of the satellites of Mars, Saturn, Uranus,...
Page 474 - Sun referred to the mean equinox of date was 279 degrees 41 minutes 48.04 seconds. Ephemeris time is the measure of time in which Newcomb's Tables of the Sun agree with observation. The primary unit of ephemeris time is the tropical year, defined by the mean motion of the sun in longitude at the epoch 1900 January 0...
Page 493 - The POSITION ANGLE of the AXIS is the angle that the lunar meridian through the apparent central point of the disk towards the north lunar pole forms with the hour circle through the central point, reckoned eastward from the north point of the disk.
Page 474 - Law, nV = tz(l + m), the semimajor axis a of an elliptical orbit must be expressed in order that the numerical value of the Gaussian constant k may be exactly 0.01720209895 when the unit of time is the ephemeris day. In astronomical units, the mean distance of the earth from the sun, calculated by the Kepler law from the observed mean motion n and adopted mass m, is 1.00000003.
Page 492 - Sun are meas ured from the solar meridian that passed through the ascending node of the solar equator on the ecliptic on 1854 January 1...
Page 474 - ET; the instant to which this designation is assigned is the instant near the beginning of the calendar year AD 1900 when the geometric mean longitude of the Sun referred to the mean equinox of date was 279 degrees 41 minutes 48.04 seconds.
Page 464 - Universal Time is the mean solar time on the Greenwich meridian, reckoned in days of 24 mean solar hours beginning with 0
Page 489 - The position angle P of the point of contact, reckoned from the north point of the limb of the Sun towards the east, may be taken as equal to its geocentric value given above.
Page 493 - When the libration in longitude, or selenographic longitude of the Earth, is positive, the mean central point of the disk is displaced eastward on the celestial sphere, exposing to view a region on the west limb. When the libration in latitude, or selenographic latitude of the Earth, is positive, the mean central point of the disk is displaced towards the south, and a region on the north limb is exposed to view.
Page 474 - Law, nV = k'(l + m), the semimajor axis a of an elliptical orbit must be expressed in order that the numerical value of the Gaussian constant, k, may be exactly 0.01720209895 when the unit of time is the ephemeris day. In astronomical units, the mean distance of the Earth from the Sun, calculated by Kepler's law from the observed mean motion n and adopted mass m, is 1.00000003.