The American Ephemeris and Nautical AlmanacU.S. Government Printing Office, 1931 - Nautical almanacs |
Contents
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Page iii - That the work of the Nautical Almanac Office during the continuance of any such arrangement shall be conducted so that in case of emergency the entire portion of the work intended for the use of navigators may be computed by the force employed by that office, and without any foreign cooperation whatsoever : Provided further, That any employee of the Nautical Almanac Office who may be authorized in any annual appropriation bill and whose services in whole or in part can be spared from the duty of...
Page iii - Navy is hereby authorized to arrange for the exchange of data with such foreign almanac offices as he may from time to time deem desirable, with a view to reducing the amount of duplication of work in preparing the different national nautical and astronomical almanacs and increasing the total data which may be of use to navigators and astronomers available for publication in the American Ephemeris and Nautical Almanac...
Page iii - ... whatsoever: Provided further, That any employee of the Nautical Almanac Office who may be authorized in any annual appropriation bill and whose services in whole or in part can be spared from the duty of preparing for publication the annual volumes of the American Ephemeris and...
Page xv - Conjunction, or having the same Longitude or Right Ascension. D Quadrature or differing 90°...
Page 676 - In the diagram on the preceding page, the points of the orbits marked "0" are those of the eastern elongations, as seen in an inverting telescope. The times of these elongations may be found from the following tables, and the apparent position of a satellite at any other time may be marked on the diagram by setting off on the proper orbit the elapsed interval in days and hours since the last eastern elongation. The orbits of the five inner satellites are regarded as circular...
Page 637 - X is taken equal to the ratio of the illuminated portion of the apparent disk to the area of the entire disk regarded as circular.
Page 574 - In the year 1897 there will be two eclipses, both of the Sun. I.— An Annular Eclipse of the Sun. February 1.
Page 676 - Washington is given. For the three outer satellites the eccentricity is taken into account, and the times both of the elongations and of the conjunctions are given. The following abbreviations are used in the tables: — E., East Elongation, I., Inferior Conjunction (south of planet), W., West Elongation, S., Superior Conjunction (north of planet).
Page 207 - BESSEL'S when only one or two apparent positions of a star are required, or when BESSEL'S star-constants are not known with sufficient accuracy. In using the star-constants of the British Association Catalogue, a, b, c, d...
Page 574 - Central eclipse begins Central eclipse at local apparent noon Central eclipse ends Eclipse ends II.