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physical phenomena > event > celestial event > periodic celestial event > equinox > autumnal equinox
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autumnal equinox
subjectfact 
autumnal equinoxhas definition See equinoxhas source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:30:03.0
is an instance of equinox2001-09-27 09:30:03.0
equinoxhas period 1 year2001-09-27 09:30:03.0
eventhas duration2001-09-27 09:29:57.0
has synonym world point2001-09-27 09:29:57.0
has time of occurrence2001-09-27 09:29:57.0