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.
The first day of winter (the winter solstice) is the shortest day of the year and the first day of summer (the summer solstice) is the longest day of the year. In the United States, there are only about 9 hours of daylight on the first day of winter and about 14 hours of daylight on the first day of summer. During the summer months, the further north you go, the arc of solar travel between sunrise and sunset lengthens and the amount of daylight increases.