Celestial horizon

From International Dictionary of Marine Aids to Navigation
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Alternative term: Rational horizon

The great circle on the celestial sphere, every point of which is 90 degrees from the observer's zenith. This circle encloses the horizontal plane through the observer and divides the celestial sphere into two hemispheres.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

second

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM