American Ephemeris

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• American Ephemeris and Nautical Almanac — The American Ephemeris and Nautical Almanac was published for the years 1855 to 1980, containing information necessary for astronomers, surveyors, and navigators. It was based on the original British publication, The Nautical Almanac and… …   Wikipedia

• Ephemeris — E*phem e*ris, n.; pl. {Ephemerides}. [L., a diary, Gr. ?, also, a calendar, fr. ?. See {Ephemera}.] 1. A diary; a journal. Johnson. [1913 Webster] 2. (Anat.) (a) A publication giving the computed places of the heavenly bodies for each day of the… …   The Collaborative International Dictionary of English

• Ephemeris — An ephemeris (plural: ephemerides; from the Greek word ἐφήμερος ephemeros daily ) is a table of values that gives the positions of astronomical objects in the sky at a given time or times. Different kinds are used for astronomy and astrology.… …   Wikipedia

• ephemeris — /i fem euhr is/, n., pl. ephemerides /ef euh mer i deez /. 1. a table showing the positions of a heavenly body on a number of dates in a regular sequence. 2. an astronomical almanac containing such tables. 3. Archaic. an almanac or calendar.… …   Universalium

• ephemeris time — Astron. time measured by the orbital movements of the earth, the moon, and the planets. [1945 50] * * * ▪ chronology       (ET), the first dynamical time scale in history; it was defined by the International Astronomical Union in the 1950s and… …   Universalium

• ephemeris second — Astron. the unit of ephemeris time, defined as a precise fraction of the length of the tropical year 1900. [1965 70] * * * ephemeris second, Astronomy. the fundamental unit of ephemeris time, adopted in 1956 by the International Bureau of Weights …   Useful english dictionary

• Astronomical Ephemeris — Der Astronomical Almanac sind ein offizielles Astronomisches Jahrbuch der internationalen Astronomie (IAU) und der Geowissenschaften (IUGG). Sie werden in den USA (Naval Observatory) und London (HMSO) herausgegeben und bilden zusammen mit den… …   Deutsch Wikipedia

• List of African-American inventors and scientists — This is an incomplete list, which may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries …   Wikipedia

• Newcomb, Simon — ▪ American astronomer and mathematician Introduction born March 12, 1835, Wallace, Nova Scotia died July 11, 1909, Washington, D.C.  Canadian born American astronomer and mathematician who prepared ephemerides tables of computed places of… …   Universalium

• Ephemerides — Ephemeris E*phem e*ris, n.; pl. {Ephemerides}. [L., a diary, Gr. ?, also, a calendar, fr. ?. See {Ephemera}.] 1. A diary; a journal. Johnson. [1913 Webster] 2. (Anat.) (a) A publication giving the computed places of the heavenly bodies for each… …   The Collaborative International Dictionary of English

• Mitchell, Maria — ▪ American astronomer born Aug. 1, 1818, Nantucket, Mass., U.S. died June 28, 1889, Lynn, Mass.       first professional woman astronomer in the United States.       Mitchell was educated in schools on her native Nantucket, Massachusetts,… …   Universalium