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Aim : How do we know the true shape of Earth?

Aim : How do we know the true shape of Earth?. Do Now : Describe the shape of Earth using your own terms. Evidence from Space 1. Photographs taken from outer space. Earth looks perfectly round and smooth. How can we prove earth is not flat?.

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Aim : How do we know the true shape of Earth?

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  1. Aim: How do we know the true shape of Earth? Do Now: Describe the shape of Earth using your own terms.

  2. Evidence from Space 1. Photographs taken from outer space. Earth looks perfectly round and smooth How can we prove earth is not flat?

  3. 2. Earth has a curved surface - when a ship sails farther away from you, the ship “appears” to sink Ships mast first to appear and last to disappear over the horizon How can we prove earth is not flat?

  4. 3. When a lunar eclipse occurs, (eclipse of the moon) the shadow of the earth has a curved circular pattern. How can we prove earth is not flat? Dec 21, 2010 lunar eclipse

  5. What is the true shape of earth? Oblate spheroid – Earth is slightly flattened at the poles and bulging (wider), at the equator Due to Earth’s rotation • Earth’s dimensions • Circumference at the Equator = 40,074 km • Equatorial diameter – 12,756 km • Circumference at the Poles = 40,007 km • Polar diameter – 12,714 km

  6. How do gravity measurements explain earth’s true shape? A person at the North Pole will weigh more because the poles are slightly flatten and are closer to the center of the earth (more gravity) • A person at the Equator will weigh less because the equator bulges (wider) and is farther from the center of the earth (less gravity)

  7. Summary Activity How do you know that the earth is not flat? How do we know the true shape of Earth? Compared to the weight of a person at the North Pole, how would the weight of a person at the equator be different? Why?

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