First Day Of Autumn
Autumn Equinox On The 23rd September 2013. The first day of autumn is the fall equinox. This is usually the day when the sun crosses the celestial equator moving southward. The dates of zero tilt of the Earth's equator usually correspond to the autumnal equinox and the vernal equinox. At this time, the sun is directly overhead at the equator and the days and nights are about the same length. It is also known as September equinox and signifies the first day of autumn in the UK.
Autumn, also known as Fall in some countries, is the season when the leaves fall from the trees.
The Autumn Equinox is celebrated on the 22nd/23rd September in the northern hemisphere, and the 20th/21st of March in the Southern Hemisphere. NB: At the North Pole the Autumn Equinox is effectively the Polar sunset whilst the South Pole experiences it as a Polar sunrise.
Also known as the September equinox, the event signifies the first day of autumn in the UK. The autumn equinox is also used to determine the date of the traditional harvest festival which is held on the first Sunday after the first full moon following the autumn equinox.
After this celebration the descent into winter brings hours of increasing darkness and chiller temperatures. It is the time of the year when night conquers day.
After the Autumn Equinox the days shorten and nights lengthen. To astrologers this is the date on which the sun enters the sign of Libra, the scales, reflecting appropriately the balanced day and night of the equinox.