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from The Century Dictionary and Cyclopedia

  • n. In astronomy: Any great circle of the sphere which passes through the two poles: so called because the hour of the day is ascertained when the circle upon which the sun is for the time being is ascertained.
  • n. A circle upon an equatorial telescope lying parallel to the plane of the earth's equator, and graduated into hours and subdivisions of hours.


Sorry, no etymologies found.



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