astronomical zenith distance

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• Zenith telescope — A zenith telescope is an instrument adapted for the measurement of small differences of zenith distance, and used in the determination of astronomic latitude.Zenith telescopes are often portable; however the Monument to the Great Fire of London… …   Wikipedia

• astronomical position line — A position line obtained by sighting a planetary body. From the geographical position, an arc is drawn which is equal to the zenith distance of the body. A tangent to this arc is the astro position line. To obtain a fix, either another astro, or… …   Aviation dictionary

• Astronomical seeing — Schematic diagram illustrating how optical wavefronts from a distant star may be perturbed by a layer of turbulent mixing in the atmosphere. The vertical scale of the wavefronts plotted is highly exaggerated. Astronomical seeing refers to the… …   Wikipedia

• York Minster astronomical clock — The York Minster astronomical clock was installed in the North Transept of York Minster in 1955. It was first conceived in 1944 and designed by R d E Atkinson, chief assistant at the Royal Greenwich Observatory. The clock is a memorial to the… …   Wikipedia

• астрономическое зенитное расстояние — Угол между направлениями на астрономический зенит данной точки и на другую точку. [ГОСТ 22268 76] Тематики геодезия Обобщающие термины системы координат EN astronomic zenith distanceastronomical zenith distance DE astronomische Zenitdistanz FR… …   Справочник технического переводчика

• Airmass — For air mass in meteorology, see air mass .In astronomy, airmass is the optical path length through Earth s atmosphere for light from a celestial source.As it passes through the atmosphere, light isattenuated by scattering and absorption; the… …   Wikipedia

• Meridian circle — Groombridge transit circle of 1806 The meridian circle, transit circle, or transit telescope is an instrument for observing the time of stars passing the meridian, at the same time measuring its angular distance from the zenith. The idea of… …   Wikipedia

• Geodesy — (pronEng|dʒiːˈɒdɪsi [OED] ), also called geodetics, a branch of earth sciences, is the scientific discipline that deals with the measurement and representation of the Earth, including its gravitational field, in a three dimensional time varying… …   Wikipedia

• Meridian altitude — is an astronomical navigation method of calculating an observer s latitude. Contents 1 Principle 2 Methodology 3 See also 4 References …   Wikipedia

• Intercept method — The Intercept Method , or Marcq St Hilaire method , as it is also rather inaccurately known, is an astronomical navigation method of calculating an observer s position on earth. It was originally called the azimuth intercept method because the… …   Wikipedia

• Barnaba Oriani — Born July 17, 1752(1752 07 17) Garegnano, Milan …   Wikipedia