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Name: Aim 27: Rotation and Revolution of the Earth Date: Do Now: Thought question…..You’ve seen the sun set and have maybe seen the sun rise. So where does the sun go when we can’t see it? What is the Earth’s Axis: A) How do objects move in our solar system? Dating way back to early civilizations, celestial objects, such as the sun and the moon, appeared to move through the sky from east to west. Because people could not feel the Earth moving, they believes that Earth was located at the center of the universe, and the sun and planets revolved around it. This model was called the Earth-centered or . Due to detailed observations, this model became unaccepted Due to detailed observations by astronomers, they soon realized that the geocentric model was complex and hard to explain. This allowed them to adopt a similar model called the _______________________________________. This model says that our solar system is sun centered and the planets, including Earth, revolve (orbit) around the sun while rotating on its axis. What is the difference between the sun’s location in the geocentric and heliocentric models? B) What are the two motions of Earth? Motion ROTATION REVOLUTION Definition How long does one full motion take? It takes the Earth _________________ to complete The earth completes one revolution in _____________________. This is equal to __________ full rotation. This is equal to ____________________. Since Earth’s revolution is not a “true” 365 days, every 4 _________________ years the ¼ days add up to a full day that has to be added on to the calendar. This is why we have __________________! How can we describe the motion? What does this affect? The motion of Earth’s rotation is from _____________ Earth travels around the sun in an _____________________ to _____________ _____________________. Stars moving across the sky, ___________________. The ____________ of the Earth’s _______________ causes rising & setting of the sun the sun to hit the Earth at different ________________. This is why our seasons have a repeating pattern. The earth is closer to the sun in the ________________ and further in the _____________. *Distance to the sun DOES NOT cause seasons! 1. How many degrees does the Earth rotate in one day? one hour? 2. What would happen to the length of day if you could decrease the rotation of the earth? 3. What would happen to the length of day if you could increase the rotation of earth? a half a day (12 hours)?