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astronomical year a unit of time equal to the period between one vernal equinox and the next.
autumn the season of the year between summer and winter, in the northern hemisphere continuing from the September equinox to the December solstice; fall.
Easter a yearly Christian festival that is held on the first Sunday after the first full moon following the spring equinox, to celebrate the resurrection of Jesus Christ. [1/2 definitions]
equinoctial of, concerning, or near the time of an equinox. [2/5 definitions]
harvest moon the full moon that occurs nearest to the autumnal equinox.
right ascension the angular distance of the arc of one of the hour circles of a celestial body, measured eastward along the equator from the vernal equinox to the intersection of the hour circle, and expressed in degrees or hours; the celestial equivalent of longitude.
spring a season of the year between winter and summer, in the northern hemisphere continuing from the March equinox to the June solstice. [1/22 definitions]
summer the warmest season of the year, falling between spring and autumn. In the northern hemisphere, summer lasts from the June solstice to the September equinox. [1/8 definitions]
winter the season of the year that is the lowest in temperature and occurs between the autumn and spring seasons. In the northern hemisphere, winter begins with the December solstice and ends at the March equinox. In the Southern hemisphere, winter begins at the summer solstice in June and ends with the autumnal equinox in September. [1/10 definitions]