The four seasons are Winter, Spring, Summer, and Fall. NASA has they own opinion about autumn. ©iStockphoto.com/Givaga. 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. Autumn as defined by the Earth’s orbit around the sun, begins on the equinox which falls on 22 or 23 September. 6. Autumnal equinox. Different year, different day. 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. The unofficial end of the summer season and the beginning of the Fall season is when the children go back to school. In Greek mythology, autumn was a time when Persephone, the daughter of Demeter, was abducted by Hades, the god-king of the underworld. 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. This happens either on … The … Fall is the term most often used to reference the season succeeding summer in the United States. The autumnal equinox typically takes place on the 22nd or 23rd of September, but there are some exceptions. On this day the amount of sun and the amount of night are equal, which is the same as the Spring equinox. September is North's fall equinox. Fall is a peak migration time for many species of birds. This day is known as the fall equinox. Autumn … 1. The first day of Autumn is at the end of September. We look at the answers to these and more interesting facts. Autumn begins. Facts about Autumn 1: aurora season. During the fall season, the geomagnetic storms are twice bigger than the other seasons. However, for the purposes of recording climate data, it is … 1. The beginning of Fall generally falls between September 21 and September 23 depending on the year. Second Equinox of the Year. Fall is the season between Summer and Winter. They call this season as the aurora season. 2. On this day, the number of hours of daylight and darkness are equal. 5. 2. Red and purple leaves are actually caused by the presence of sugars from sap that is trapped inside of the leaves. The September equinox occurs the moment the sun crosses the celestial equator – the imaginary line in the sky above the Earth’s equator – from north to south. Autumn is another word used for Fall. Fall or Autumn is one of the four seasons. The first day of autumn is known as the autumnal equinox. Get facts about auroras here. The last day of Autumn falls on December 21 to … 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. 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