SWBAT Determine how ancient humans discovered the Earth’s true shape.

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Presentation transcript:

SWBAT Determine how ancient humans discovered the Earth’s true shape

Do Now Describe how you think the Earth formed.

The Earth’s shape Oblate sphere

How do we know the earth is a sphere? EVIDENCE Pictures from space Lunar eclipse-the earth’s shadow on the moon is round

How do we know the earth is a sphere? As a ship sails away from you, the bottom disappears before the top of the sail The altitude of Polaris (the North Star) increases as you move northward

How do we know the earth is a sphere? The earth is not actually a perfect sphere. It is very slightly wider at the equator. This shape is called an oblate spheroid. Earth’s circumference: Equator: 40,076 miles Poles: 40,008 miles

Which diagram most accurately shows the cross-sectional shape of the Earth drawn to scale? (1) (2) (3) (4)

Polaris

Begin Spheres lesson

TOP 10 REASONS Why We Know the Earth is Round VIDEO

Which is a way ancient humans knew the Earth was a sphere Sailing Ships Lunar Eclipse Polaris All of the above

True or False Thumbs Up or Thumbs Down Polaris is located in the southern hemisphere? False