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The Planet Earth

The Planet Earth. What is the SIZE of the Earth?. Can you measure the SIZE of the Earth from your observation point?. 200 BC. ERATOSTHENES Measured the distance around the earth without leaving E gypt.

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The Planet Earth

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  1. The PlanetEarth

  2. What is the SIZE of the Earth?

  3. Can you measure the SIZE of the Earth from your observation point?

  4. 200 BC ERATOSTHENES • Measured the distance around the earth without leaving Egypt. • Assumed the earth is perfectly round and represented it in his drawings with a circle.

  5. Parts of the Circle

  6. IMPORTANTFormulas

  7. How did Eratosthenes measure the size of the earth?

  8. Eratosthenes’ Way • Measured the distance between Syene (present day Aswan) and Alexandria 500 mi ≈ 800 km

  9. Summer Solstice • June 21st • Longest day of the year

  10. Eratosthenes’ Calculation Circumference of the Earth:25000 mi Find the diameter and radius of the Earth

  11. Measure of the Earth Circumference ≈ 24 900 mi ≈ 40003.60 km Diameter ≈ 12 740 km Radius≈ 6370 km Note: These are only approximates since the earth is not perfectly round

  12. 7 926 mi ≈ 12 756 km 7 900 mi ≈ 12 714 km

  13. THINGS TO BRING: • RULER • PROTRACTOR • DRAWING COMPASS

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