In Sweden the title psychologist is restricted in law. It can only be used after receiving a license from the government. The basic requirements are a completed five years specialised course in psychology (equivalent of a master's degree) and 12 months of practice under supervision.
Because the earth's axis is tilted. It is all about the tilt of the Earth's axis. Many people believe that the temperature changes because the Earth is closer to the sun in summer and farther from the sun in winter. In fact, the Earth is farthest from the sun in July and is closest to the sun in January! During the summer, the sun's rays hit the Earth at a steep angle.
Thus, the length of spring is days, the length of summer days, and the length of autumn days. Finally, the length of winter is the length of the tropical year (i.e. , the time period between successive vernal equinoxes), which is days, minus the sum of the lengths of the other three seasons.