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physical phenomena > event > celestial event > periodic celestial event > location dependent periodic celestial event > astronomical horizon event > sunset |
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. | ||
sunset | astronomical horizon event | 1 day | The 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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