The tilt has two major effects: the angle of the Sun to the earth and length of the days. In scientific terms, the Earth is tilted 23.5 degrees from its orbital plane with the Sun. However, the Earth doesn't rotate in a straight up and down manner relative to the Sun. Not only does the Earth revolve around the Sun every year, but the Earth rotates on its axis every 24 hours. As the Earth orbits the Sun, the amount of sunlight each location on the planet gets every day changes slightly. The Earth travels around the Sun, called an orbit, once a year or every 365 days. Seasons are caused because of the Earth's changing relationship to the Sun. Some animals, like bears, hibernate in the winter while other animals, like birds, migrate to warmer climates. Winter is cold and it snows in many places. In autumn the leaves change colors and fall off the trees and school starts again. Often crops are harvested at the end of the summer. Summer is hot and is when kids are usually out of school and we take vacations to the beach. In the spring, animals are born and plants come back to life. The seasons have a lot of impact on what happens on the earth. Each season lasts 3 months with summer being the warmest season, winter being the coldest, and spring and autumn lying in between. We divide up the year into four seasons: spring, summer, autumn, and winter.
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