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26-inch equatorial 6-inch transit circle aeronautical ALT-AZIMUTH American Ephemeris American Nautical Almanac annual report April Asaph Hall Assistant Astronomer asteroids Astronomical Journal August Bliss Bureau of Navigation C. B. Watts Capt catalogue charge chronometers clock corrections Clock stars Comet Commander computing continued declination determination division eclipse Ephemeris and Nautical equipment F. B. Littell fiscal G. H. Peters gyro gyro-compass inspection inspector of navigational installed January July Lieut Longines March Mean daily rates ment micrometer moon Nardin Nautical Almanac nautical instrument repair nautical instruments Naval Observatory Naval Reserve Force navigational material navy yard Negus Number of instruments number of observations patrol-boat personnel PHOTOGRAPHIC ZENITH TUBE prime vertical proper motion reduction right ascension sextants ships solar Special temperatures Sperry Mark standard stars superintendent supply tion torpedo-boat watches Total transit circle U. S. Naval Observatory United States Navy Value of instruments vessels Washington
Page 3 - Observatory performs continuous observation of celestial bodies, natural and artificial; derives and publishes such data as will afford to United States Naval vessels and aircraft, as well as to all availing themselves thereof, means for safe navigation, including the provision of accurate time; and while pursuing this primary function, contributes materially to the general advancement of navigation and astronomy.
Page 58 - The principal work of the observatory shall be in the field of the astronomy of position as distinguished from astro-physical work, and shall be the continued maintenance of observations for absolute positions of the fundamental stars and of stars which are to be made fundamental, and in addition the independent determination by observations of the sun, of the...
Page 63 - Ephemeris of the great comet of 1858," AN, v. 64, 1865, p. 181 190. 5. "On the reduction of the rectangular coordinates of the sun referred to the true equator and equinox of date to those referred to the mean equator and equinox of the beginning of the year,
Page 40 - Persons on a regular mailing list of the Department of Commerce should give prompt notice to the " Division of Publications, Department of Commerce, Washington, DC," of any change of address, stating specifically the form of address in which the publication has previously been received, as well as the new address. The Department should also be advised promptly when a publication is no longer desired.
Page 45 - WORK The astronomy of position, contemplating continuous observations of the sun, moon, planets, and fundamental stars for the determination of absolute positions, including the position of the equator and equinox among the stars, and essential contributory observations. Other astronomical investigations of general or special scientific value, either independently or in cooperation with other observatories, undertaken so far as time, opportunity, and the demands of the principal observational work...
Page 58 - The astronomical observations to accomplish these ends are necessarily continuous and unremitting, but are not sufficient of themselves to give full and constant employment either to the observers or the instruments.
Page 22 - Comite International Permanent pour 1'Execution Photographique de la Carte du Ciel.
Page 34 - ... days of gyro development it practically supported that development. The personnel of this Division consists of two naval officers. Air Navigation and Aerological Instrument Division. The Air Navigation and Aerological Instrument Division has charge of the handling, inspection, development, etc., of all aircraft compasses and instruments for aerial navigation, ground instruments used in connection with air navigation and the aerological instruments at naval air stations and on board aircraft carriers...