Autumn is one of the four seasons and two in the tropics. Astronomically, it begins with the autumnal equinox (September 23 in the northern hemisphere and March 21 in the southern hemisphere) and ends with the winter solstice (around December 21 in the northern hemisphere and June 21 in the southern hemisphere )
However, commonly it is known as autumn period which covers the months of September, October and November in the northern hemisphere and March, April and May in the southern hemisphere.
In both hemispheres, it is the harvest season, for example, maize and sunflower. In literature, the fall, figuratively represents maturity.
During this season the temperature starts to drop. The leaves of deciduous trees change their green color ocher, until dry and fall helped by the wind blowing harder.
Although a color change occurs in the leaves of deciduous trees, the foliage color change is observed more in various regions of the world such as North America, East Asia (including China, Korea and Japan), Europe, Patagonia, eastern Australia and the South Island of New Zealand.
Japan, Canada and New England are popular for observing the fall foliage destinations.
During the autumn many festivities take place. The best known are Halloween and Thanksgiving, very popular in the Anglo-Saxon. In Spain and Latin America, the most important day is undoubtedly the Day of All Saints, which like Halloween was originally a festival linked to worship and respect for the deceased.