Seasons. What do you KNOW about seasons?. The Big Idea. Students will understand how Earth’s tilt on its axis changes the length of daylight and creates the seasons. Objective 1: Describe the relationship between the tilt of Earth\'s axis and its yearly orbit around the sun.
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A regular change in temperature that repeats itself every year
Axis - imaginary line around which Earth spins, causing day and night, and that is drawn from the north geographic pole through Earth to the south geographic pole
Rotation - spinning of Earth on its axis, which causes day and night; it takes 24 hours for Earth to complete one rotation
Revolution - the motion of Earth around the Sun, which takes about 365 1/4 days, or one year, to complete
Orbit - curved path followed by Earth as it moves around the Sun
The Earth\'s axis is tilted by 23.5°
The angle the Sun is above the horizon determines how much heat and light strike each square meter of ground.
More energy is received by the ground during the summer (high temperatures) and less energy during the winter (lower temperatures).
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I know this is a repeat, but it is important that you understand this idea. Many Americans, including Harvard graduates, do not know what causes seasons!
Imagine Earth as it revolves around the sun. The table below shows Earth at opposite sides of the sun. These two examples represent Earth\'s position for summer and winter.