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physical phenomena > event > celestial event > periodic celestial event > location dependent periodic celestial event > astronomical horizon event > sunrise |
sunrise | ||||
subject | fact |
sunrise | 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 |