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2017 Word of the Year

zenith distance

noun, Astronomy.
1.
the angular distance from the zenith of a point on the celestial sphere to the sphere, measured along a great circle that is perpendicular to the horizon; the complement of the altitude.
Origin of zenith distance
1695-1705
First recorded in 1695-1705
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for zenith distance
Historical Examples
  • Then the zenith distance is the distance from your zenith to the center of the sun.

    Lectures in Navigation Ernest Gallaudet Draper
  • Z0 is the zenith distance of the moon's center midway through the hour of observation, that is, at the half hour.

  • The zenith distance of a body is measured on a vertical circle passing through that body.

    Letters on Astronomy Denison Olmsted
  • Or it may be used to measure the altitude of a body, or its zenith distance, at the time of its meridian passage.

    Letters on Astronomy Denison Olmsted
  • The latitudes were determined by observations with a sector (made by George Graham) of the zenith distance of α and δ Draconis.

  • He certainly found an annual variation of zenith distance, but not at the times of year required by the parallax.

    History of Astronomy George Forbes
  • The zenith distance of any point or celestial body is its angular distance from the zenith of the observer.

    Lectures in Navigation Ernest Gallaudet Draper
  • zenith distance is the distance in degrees, minutes and seconds from your zenith to the center of the observed body.

    Lectures in Navigation Ernest Gallaudet Draper
  • So far as illustrating the zenith distance minus the Declination, however, the diagram is correct.

    Lectures in Navigation Ernest Gallaudet Draper
  • The last case is where you are, say, 10 N of the sun (your zenith distance is 10) and the sun is in 20 S declination.

    Lectures in Navigation Ernest Gallaudet Draper

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Word Value for zenith

18
18
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