1. The Planet Earth

2. What is the Shape of the Earth?

3. 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.

4. 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

5. The Earth is Round

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

7. Horizon The line where the sky and the ground seem to meet
The greatest distance an observer sees on the Earth’s 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

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

10. Evidence that the Earth is Round

11. Space Photos

12. Sinking Ship Theory

13. Altitude of Polaris = Latitude

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

17. Astrolabe

19. Star Paths Across the Sky

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

21. Lunar Eclipse

22. 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

24. Apparent Shape
Earth appears to be a PERFECT Sphere

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

27. Current Findings
The Earth is like a lumpy POTATO