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Meridian circle

Meridian circle

Astronomical instrument for timing of the passage of stars.

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Share of the 162 clicks on its links

  1. Meridian (astronomy)

    Great semicircle passing through the celestial poles.

    31%

  2. Nadir

    Direction pointing directly below a particular location.

    30%

  3. Groombridge Transit Circle

    17%

  4. Theodolite

    Optical surveying instrument.

    15%

  5. Culmination

    Passage of an astronomical body across the meridian.

    6.8%

Readers come from

Share of the 991 readers arriving from another article

  1. IERS Reference Meridian

    International prime meridian used for GPS and other systems.

    25%

  2. Prime meridian

    Line of longitude, at which longitude is defined to be 0°.

    15%

  3. Ole Rømer

    Danish astronomer (1644–1710).

    12%

  4. Prime meridian (Greenwich)

    Meridian passing through Greenwich, London.

    10%

  5. Carl Friedrich Gauss

    German polymath and scholar (1777–1855).

    8.7%

  6. Royal Observatory, Greenwich

    Observatory in London, England.

    5.3%

  7. Solar time

    Calculation of elapsed time by the apparent position of the sun.

    2.1%

  8. History of longitude

    Record of humanity's attempts to find east-west position on Earth.

    1.2%

  9. Time in China

    1.1%

  10. Transit instrument

    Small telescope used for precise astrometry.

    1.1%