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Fall or Autumn is one of the four seasons. The autumnal equinox typically takes place on the 22nd or 23rd of September, but there are some exceptions. But why do the leaves change colour and when does autumn actually begin? Fall is a peak migration time for many species of birds. Second Equinox of the Year. ©iStockphoto.com/Givaga. However, for the purposes of recording climate data, it is … 1. 6. This day is known as the fall equinox. Autumn as defined by the Earth’s orbit around the sun, begins on the equinox which falls on 22 or 23 September. Get facts about auroras here. Different year, different day. As fall foliage creates a colorful display and kids frolic in leaf piles on the lawn, you may want to pay some mind to a few lesser known facts about this beloved time of year. Fall is the season between Summer and Winter. NASA has they own opinion about autumn. In Greek mythology, autumn was a time when Persephone, the daughter of Demeter, was abducted by Hades, the god-king of the underworld. On this day the amount of sun and the amount of night are equal, which is the same as the Spring equinox. We look at the answers to these and more interesting facts. On this day, the number of hours of daylight and darkness are equal. Red and purple leaves are actually caused by the presence of sugars from sap that is trapped inside of the leaves. Come autumn, however, when the sun weakens and days grow shorter, the amount of chlorophyll in leaves diminishes, allowing the other pigments in the leaves to show through. Autumn begins. 1. Autumn is another word used for Fall. The four seasons are Winter, Spring, Summer, and Fall. They call this season as the aurora season. Fall is the term most often used to reference the season succeeding summer in the United States. A season by any other name . You may be surprised to learn the following facts about autumn leaves: Leaves require sunlight, water, chlorophyll and carbon dioxide to make food for themselves. The September equinox is on or around September 22, while the first equinox of the year, the March Equinox, takes place on or around March 21 every year. Autumn … Interesting facts about Autumn: 1. 5. There are two different dates when autumn could be said to begin. During the fall season, the geomagnetic storms are twice bigger than the other seasons. The last day of Autumn falls on December 21 to … As winter approaches, leaves make a coating for themselves which blocks their water source; in the absence of water, the leaves no longer produce chlorophyll (chlorophyll is what makes leaves green). The beginning of Fall generally falls between September 21 and September 23 depending on the year. 2. The first day of Autumn is at the end of September. Autumnal equinox. 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