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physical phenomena > event > celestial event > periodic celestial event > location dependent periodic celestial event > astronomical horizon event > sunset
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sunset comparison table
Subject is an instance of is a kind of has period has definition
astronomical horizon event location dependent periodic celestial event The time and azimuth at which a celestial body crosses the astronomical horizon of an oberver.
sunsetastronomical horizon event 1 dayThe times at which the apparent upper limb of the Sun is on the astronomical horizon; i.e., when the true zenith distance, referred to the center of the Earth, of the central point of the disk is 90°50', based on adopted values of 34' for horizontal refraction and 16' for the Sun's semidiameter.

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