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

2. 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.

3. Earth From Space
Photographs of Earth from space

4. 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 l

5. 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

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

7. C. Weight on Earth