1. Earth’s Shape

2. Earth’s Shape The Earth is not a perfect sphere
Because of its rotation it is slightly fatter at the equator
This shape is known as an oblate sphere

3. Evidence of Earth’s Shape
Pictures From Space
Ships at Sea

4. Looks like the city is in the water.

6. Looks like the ship is rising from the water because it is going over the horizon.

7. Evidence of Earth’s Shape
Pictures From Space
Ships at Sea
Lunar Eclipse

8. Lunar Eclipse
When moon passes into Earth’s shadow

9. Lunar Eclipse
The shadow on the Moon is Earth’s shadow. If the shadow is curved the Earth must be curved.

10. Evidence of Earth’s Shape
Pictures From Space
Ships at Sea
Lunar Eclipse
Gravity / weight Measurements

11. Gravity / Weight Measurements
Gravity weakens as you move further from the center of the Earth
If the Earth was a perfect sphere than an object would weigh the same everywhere on Earth
Objects weigh more at the poles than at equator
Larger distance than at poles

12. Evidence of Earth’s Shape
Pictures From Space
Ships at Sea
Lunar Eclipse
Gravity / weight Measurements
Changing Altitude of Stars

13. Changing Altitude of Stars
Polaris
At the North Pole Polaris is 90o above the horizon X
At lower latitudes Polaris is lower in the sky