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The Planet Earth

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What is the Shape of the Earth?

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Tagbanwas of Palawan Believed that land is mostly mountains surrounded by water, and underneath is an exact but inverted image of land and water and all that are in them.

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Shape of the Earth About 100 BC to 1500 AD Mayans and Aztecs of South Americas -believed the earth had a general shape of a flat cross About 1400 BC Hindu Writing -described the earth as a round disk 200 BC Aristarchus -Reasoned that the earth is round

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The Earth is Round

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How does the Earth appear to an observer in an open field where no trees or buildings block his view?

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Horizon The line where the sky and the ground seem to meet The greatest distance an observer sees on the Earths surface. A 1.6 m tall person can see up to 4.5 km away At 2500 m high one can see up to 178 km away

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Activity # 1 1.List at least seven differences in your notebook. 2.What are the possible explanations for the change in scenery?

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Evidence that the Earth is Round

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Space Photos

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Sinking Ship Theory

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Altitude of Polaris Altitude of Polaris = Latitude

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All other stars will move in a counterclockwise direction but Polaris will stay as it is

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Astrolabe

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Star Paths Across the Sky

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Activity #2 Object Shadow/s formed (identify by number) Egg Kalamansi Coin Jar Cover Ball Can

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Lunar Eclipse

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True Shape of the Earth Oblate spheroid Poles squished and equator bulges Earth rotates on its axis centripetal force pushes squishes the poles and pushes out in the equator

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Apparent Shape Earth appears to be a PERFECT Sphere

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Gravity Measurement Weigh more at South Pole closer Weight less at Equator farther

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Current Findings The Earth is like a lumpy POTATO