Earth Sun system

Discover how Earth's rotation and revolution create day, night, and seasons! Explore the amazing Earth Sun system.

Rotation and Revolution Watch the video and fill in the blanks in the summary below. The Earth is spinning around an imaginary line called its axis. The axis passes through the north pole and south pole. The reason for day and night is that the Earth is rotatingaround its axis. As the Earth spins about its axis it revolvesaround the Sun on its orbit path. So, to summarize each time the Earth rotates around its axis 1 dayhas been completed and every time the Earth completes one revolution 1 yearhas been completed. One day is 24 hours long and one year is 365.25days long. The Earth is tiltedon its axis so that the north and south pole are not straight up and down, but slanted at an angel of 23.5degrees. Because of this tilt the amount of direct sunlight received at different points on the Earth changes throughout the year. This is why we have seasons. As the Earth revolves around the sun the angle of solar radiation changes for different parts of the world. When the northern hemisphere experiences summer the southern hemisphere experiences winter. Day and Night in the North Pole At what time of day will the sun set at the North Pole in the diagram above? 12:00 PM 6:00 PM 12:00 AM It will not set at all. The image above shows _ in the North Pole. winter spring summer fall How many hours of daylight are there at the equator. 24 hours 12 hours It depends on the time of year. Use this diagram to answer the next three questions. In the diagram above which number represents the position of the Earth during winter in the Southern Hemisphere? 1 2 3 4 Int he diagram above which numbers represent the positions of the Earth during the equinoxes? 1 2 3 4 2 4 1 3 In the diagram above what season is it in the Northern Hemisphere in the 4th drawing? summer fall winter spring Solar Radiation Use the diagram above to fill in the blanks below. This drawing shows summerin the Southern Hemisphere and winter in the Northern Hemisphere. During the equinoxes the most intense solar radiation is at the equator, but in this drawing the most intense solar radiation is 23.5 degrees latitude southof the equator, right in the middle of the tilted Earth. This means that the equator does not get the most direct sunlight during summer winter, but over one whole year (winter, spring, summer, fall) the equator stays never leaves the zone of direct sunlight. This zone of direct sunlight is known as the tropics. The tropics are between the latitudes of 23.5 degrees north and 23.5 degrees south, between the south of Brazil and the middle of Mexico.However, even in summer at the North and South Poles it is colder than the equator. This is because the solar radiation at the poles is less direct and therefore, more spread out, and at the equator the sun light hits the Earth more direct and therefor, more concentrated. Matching summer The time of year when sunlight is most direct. Fall and Spring Equinox December 21 and June 21 Solstice Rotation Spin Revolution Orbit Hemisphere Half of the Earth Equator The middle line of latitude. 23.5 degrees Tilt of the Earth on its axis.