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- Meridian_circle abstract "The meridian circle is an instrument for timing of the passage of stars across the local meridian, an event known as a transit, while at the same time measuring their angular distance from the nadir. These are special purpose telescopes mounted so as to allow pointing only in the meridian, the great circle through the north point of the horizon, the zenith, the south point of the horizon, and the nadir. Meridian telescopes rely on the rotation of the Earth to bring objects into their field of view and are mounted on a fixed, horizontal, east-west axis.The similar transit instrument, transit circle or transit telescope is likewise mounted on a horizontal axis, but the axis need not be fixed in the east-west direction. For instance, a surveyor's theodolite can function as a transit instrument if its telescope is capable of a full revolution about the horizontal axis. Meridian circles are often called by these names, although they are less specific.For many years, transit timings were the most accurate method of measuring the positions of heavenly bodies, and meridian instruments were relied upon to perform this painstaking work. Before spectroscopy, photography, and the perfection of reflecting telescopes, the measuring of positions (and the deriving of orbits and astronomical constants) was the major work of observatories.".
- Meridian_circle thumbnail Groombridge_transit_circle.jpg?width=300.
- Meridian_circle wikiPageExternalLink books?id=8FxIAAAAYAAJ&source=gbs_navlinks_s.
- Meridian_circle wikiPageExternalLink v=onepage&q=%22transit%20instrument%22&f=false.
- Meridian_circle wikiPageExternalLink v=onepage&q=meridian%20circle&f=false.
- Meridian_circle wikiPageExternalLink camc.html.
- Meridian_circle wikiPageExternalLink ast84.
- Meridian_circle wikiPageExternalLink fastt.html.
- Meridian_circle wikiPageID "3391863".
- Meridian_circle wikiPageRevisionID "590545595".
- Meridian_circle hasPhotoCollection Meridian_circle.
- Meridian_circle subject Category:Astrometry.
- Meridian_circle subject Category:Telescopes.
- Meridian_circle point "48.212519444444446 16.291394444444446".
- Meridian_circle type Artifact100021939.
- Meridian_circle type Device103183080.
- Meridian_circle type Instrument103574816.
- Meridian_circle type Instrumentality103575240.
- Meridian_circle type Magnifier103709206.
- Meridian_circle type Object100002684.
- Meridian_circle type PhysicalEntity100001930.
- Meridian_circle type ScientificInstrument104147495.
- Meridian_circle type Telescope104403638.
- Meridian_circle type Telescopes.
- Meridian_circle type Whole100003553.
- Meridian_circle type SpatialThing.
- Meridian_circle comment "The meridian circle is an instrument for timing of the passage of stars across the local meridian, an event known as a transit, while at the same time measuring their angular distance from the nadir. These are special purpose telescopes mounted so as to allow pointing only in the meridian, the great circle through the north point of the horizon, the zenith, the south point of the horizon, and the nadir.".
- Meridian_circle label "Koło południkowe".
- Meridian_circle label "Luneta meridiana".
- Meridian_circle label "Lunette méridienne".
- Meridian_circle label "Meridiaankijker".
- Meridian_circle label "Meridian circle".
- Meridian_circle label "Meridiankreis".
- Meridian_circle label "Strumento dei passaggi".
- Meridian_circle label "Меридианный круг".
- Meridian_circle sameAs Meridiankreis.
- Meridian_circle sameAs Lunette_méridienne.
- Meridian_circle sameAs Strumento_dei_passaggi.
- Meridian_circle sameAs Meridiaankijker.
- Meridian_circle sameAs Koło_południkowe.
- Meridian_circle sameAs Luneta_meridiana.
- Meridian_circle sameAs m.099535.
- Meridian_circle sameAs Q364882.
- Meridian_circle sameAs Q364882.
- Meridian_circle sameAs Meridian_circle.
- Meridian_circle lat "48.212519444444446".
- Meridian_circle long "16.291394444444446".
- Meridian_circle wasDerivedFrom Meridian_circle?oldid=590545595.
- Meridian_circle depiction Groombridge_transit_circle.jpg.
- Meridian_circle isPrimaryTopicOf Meridian_circle.
