Earth’s seasons are characterized by differences in temperature and day length. Four different seasons spring, summer, autumn and winter that are exist only in temperate zones. These zones are widespread between latitudes 23.5 degrees of North (and south), 66.5 degrees of North (and south). In tropical or subtropical regions there is no significant seasonal changes and there are only two seasons, wet and dry seasons. Polarize zones have just two seasons, light and dark seasons. We will start our research on this topic and would like to say that there is symmetry between different temperatures. It means that the temperature that creates the spring is the same as the temperature that creates winter and our planet earth has only one season that in temperate regions, it is divided into four seasons and these four seasons emerge in the quantity of a quarter 1/4. Among the nine planets in solar system, only in the planet earth there is symmetry between the sun heat and the frigidity that we will show this symmetry in our planet earth with a simple equation.