Autumn, the time of year between summer and winter when temperatures drop steadily. It is often called the 'fall' because the leaves fall off trees at the time. Autumn is generally defined in the northern hemisphere as a period between the autumn equinox (day and night equals long), September 22 or 23, and winter sunset (the shortest day of the year), December 21 or 22; and in the southern hemisphere as a period between march 20 or 21 and June 21 or 22. The change in autumn temperature between summer heat and winter cold occurs only in the central and highlands; in the equator, temperatures often vary slightly during the year. In cooler regions the autumn is much shorter.

seasons

Some of the facts of autumn seasons are:

Fall of trees:

Trees prepare for winter. One of the most amazing autumn signs is leaf rot. Short days are a sign in the trees to start preparing for winter. In winter there is not enough light for photosynthesis, so as the days get shorter throughout the autumn, the trees begin to shut down their food production systems and reduces the amount of chlorophyll in their leaves.

seasons

Vibrant fall colors:

Chlorophyll is a chemical that makes the leaves of the tree green and as it shrinks some of the most prominent chemicals in the leaves. These are responsible for bright amber, red and yellow in autumn. Responsible chemicals are a variety of flavonoids, carotenoids and anthocyanins. The fall colors are the most attractive and unique feature of this season.

seasons

Persephone Return:

In Greek mythology, autumn began when Persephone was captured by Hades to become the Queen of the Underworld. Depressed Persephone's mother, Demeter (goddess of harvest), caused all the plants in the world to die until her daughter was allowed to return, marking the spring.

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