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prime vertical

noun
1.
(astronomy) the great circle passing through the observer's zenith and meeting the horizon due east and west
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for prime vertical
Historical Examples
  • The transit instrument is also used in the prime vertical for the determination of latitudes.

  • The prime vertical is that vertical circle which passes through the east and west points.

    Letters on Astronomy Denison Olmsted
  • The amplitude of a star is its distance from the prime vertical, measured on the horizon, north or south.

    Astronomical Lore in Chaucer Florence M. Grimm
  • The amplitude of a body is its distance, on the horizon, from the prime vertical to a vertical circle passing through the body.

    Letters on Astronomy Denison Olmsted
  • Take the morning sight for longitude when the sun is on or as near as possible to the prime vertical.

    Lectures in Navigation Ernest Gallaudet Draper
  • The imaginary circle which passes immediately over your head as you face the South is called the prime vertical.

    Astrology Sepharial

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