coelostat

coelostat
/see"leuh stat'/, n. Astron.
an apparatus consisting of a mirror driven by clockwork, used to enable a fixed telescope to keep the same area of sky in its field of view by compensating for the apparent rotation of the celestial sphere. Cf. siderostat.
[1895-1900; coelo- (for L caeli-, comb. form of caelum sky) + -STAT]

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▪ astronomical instrument
      device consisting of a flat mirror that is turned slowly by a motor to reflect the Sun continuously into a fixed telescope. The mirror is mounted to rotate about an axis through its front surface that points to a celestial pole and is driven at the rate of one revolution in 48 hours. The telescope image is then stationary and nonrotating. The coelostat is particularly useful in eclipse expeditions when elaborate equatorial mounting of telescopes is impossible. Other instruments applying the principle of the coelostat for similar observations are the heliostat, which produces a rotating image of the Sun, and the siderostat, which is like a heliostat but is used to observe stars.

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Universalium. 2010.

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Look at other dictionaries:

  • coelostat — coe lo*stat n. an optical instrument used to follow the path of a celestial body and reflect its light into a telescope; it has a movable and a fixed mirror. [WordNet 1.5] || …   The Collaborative International Dictionary of English

  • Coelostat —   [tsø...], Astronomie: Zölostat …   Universal-Lexikon

  • coelostat — [sē′lə stat΄] n. [< L caelum, sky, heavens + STAT] an optical system, used with a fixed telescope, consisting of two mirrors with a moving mirror mounted on an axis parallel to the earth s axis of rotation and driven by clockwork so as to… …   English World dictionary

  • Coelostat — Der Coelostat ist ein Hilfsinstrument in der praktischen Astronomie. Mittels der zwei beweglichen Spiegel des Coelostaten wird das Licht der Sonne so umgelenkt, dass es immer in ein ortsfest aufgestelltes Beobachtungsgerät fällt. Da man bei… …   Deutsch Wikipedia

  • coelostat — noun A device that rotates a telescope so as to keep its orientation constant with relation to the …   Wiktionary

  • coelostat — coe·lo·stat …   English syllables

  • coelostat — n. Astron. an instrument with a rotating mirror that continuously reflects the light from the same area of sky allowing the path of a celestial body to be monitored. Etymology: L caelum sky + STAT …   Useful english dictionary

  • Zölostat — Der Coelostat ist ein Hilfsinstrument in der praktischen Astronomie. Mittels der zwei beweglichen Spiegel des Coelostaten wird das Licht der Sonne so umgelenkt, dass es immer in ein ortsfest aufgestelltes Beobachtungsgerät fällt. Da man bei… …   Deutsch Wikipedia

  • Bernhard Schmidt — Bernhard Woldemar Schmidt (March 30, 1879 ndash; December 1, 1935) was an Estonian Swede optician who spent his adult life in Germany. In 1930 he invented the Schmidt telescope which corrected for the optical errors of spherical aberration, coma …   Wikipedia

  • Kodaikanal Solar Observatory — Kodaikanal Solar ObservatoryOrganizationIndian Institute of AstrophysicsLocationKodaikanal, IndiaCoordinatescoord|10|13|50|N|77|28|7|E|Altitude 2,343 meters (7,687 ft) Webpage [http://www.iiap.res.in/centres kodai.htm Kodaikanal Observatory]… …   Wikipedia

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