Do Now: What is the shape of the Earth? How do you know?

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Presentation transcript:

Do Now: What is the shape of the Earth? How do you know?

V. Earth’s Shape Evidence that Earth is Spherical The mast of a ship is the 1st part to appear over the horizon & the last to disappear.

Earth From Space Photographs of Earth from space

An eclipse of the moon occurs when Earth's shadow falls on the moon Earth’s Shape Cont’ An eclipse of the moon occurs when Earth's shadow falls on the moon The shadow is always an arc of a circle http://www.rit.edu/~andpph/eclipse-01-20-00.htm l

Earth’s Shape Cont’ Ships sailing north or south observed changes in the nighttime sky. North Star appears higher in the sky as a ship travels north Ships sailing south lose sight of the Big Dipper & begin to see the Southern Cross

B. Oblate Spheroid Sphere that is slightly flattened at the poles & bulged at the equator Caused by Earth's rotation

C. Weight on Earth