The Seasons

Duration of the Seasons - 2009
Season	Begins [MST]	Ends [MST]	Duration*
Winter	Winter Solstice (2008) - Dec 21, 5:04 am	Vernal Equinox - Mar 20, 4:44 am	88^d 23^hr 40^min
Spring	Vernal Equinox - Mar 20, 4:44 am	Summer Solstice - Jun 20, 10:45 pm	92^d 18^hr 01^min
Summer	Summer Solstice - Jun 20, 10:45 pm	Autumnal Equinox - Sep 22, 2:18 pm	93^d 15^hr 33^min
Fall	Autumnal Equinox - Sep 22, 2:18 pm	Winter Solstice - Dec 21, 10:47 am	89^d 20^hr 29^min
		Total	365^d 5^hr 43^min

*Because of nutation, the seasonal lengths vary by a few minutes from year to year. This is evident if the 2009 seasonal lengths above
are compared with those of 2008. The seasonal lengths in 2008 were: Winter - 88^d 23^hr 36^min, Spring - 92^d 18^hr 11^min, Summer -
93^d 15^hr 45^min, Fall - 89^d 20^hr 20^min.