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