sunset concept from the Astronomy knowledge base

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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

subject fact

sunset has period 1 day 2001-09-27 09:30:03.0
has definition 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. has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:30:03.0
is an instance of astronomical horizon event

location dependent periodic celestial event has observer location

event has duration 2001-09-27 09:29:57.0
has synonym world point
has time of occurrence

sunset	has period 1 day
	has definition 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.
	is an instance of astronomical horizon event
location dependent periodic celestial event	has observer location
event	has duration
	has synonym world point
	has time of occurrence