Last Day of Summer: What Time is Autumnal Equinox on September 21, 2012

At the Autumnal Equinox (Fall Equinox) and Vernal Equinox (Spring Equinox), duration for day and night optimally the same length – 12 hours.

The Autumnal Equinox is at 1449 UTC all over the world. In Chicago the Autumnal Equinox is 9:49 a.m.

The Autumnal Equinox, which happens either September 22, 23, or 24 every year, occurs the moment the sun crosses the celestial equator — heading south for the Winter.

See this Google Map graph (SunCalc.net) of the sunrise and sunset position, which is practically due East and due West, respectively.

Today could be considered one the worst days of the year for driving facing sunrise or sunset. The sun would be right at the end of the road on east-west routes.

Weather Forecast Today is CLOUDY

Today Showers likely, mainly after 1pm. Mostly cloudy, with a high near 64. West wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Tonight A chance of showers before 1am, then a chance of showers after 4am. Mostly cloudy, with a low around 47. North wind around 5 mph becoming west southwest in the evening. Chance of precipitation is 50%.
Saturday Showers likely, mainly between 7am and 1pm. Partly sunny, with a high near 59. Northwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday Night Mostly clear, with a low around 38. Northwest wind 5 to 15 mph, with gusts as high as 20 mph.

Sunday Sunny, with a high near 58. West northwest wind 5 to 15 mph.

Sunday Night Mostly clear, with a low around 40.



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