The planet earth
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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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The planet earth

The PlanetEarth


What is the size of the earth

What is the SIZE of the Earth?


Can you measure the size of the earth from your observation point

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


200 bc

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.


Parts of the circle

Parts of the Circle


Important formulas

IMPORTANTFormulas


How did eratosthenes measure the size of the earth

How did Eratosthenes measure the size of the earth?


Eratosthenes way

Eratosthenes’ Way

  • Measured the distance between Syene (present day Aswan) and Alexandria

    500 mi ≈ 800 km


Summer solstice

Summer Solstice

  • June 21st

  • Longest day of the year


Eratosthenes calculation

Eratosthenes’ Calculation

Circumference of the Earth:25000 mi

Find the diameter and radius of the Earth


Measure of the earth

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


The planet earth

7 926 mi ≈ 12 756 km

7 900 mi ≈ 12 714 km


Things to bring

THINGS TO BRING:

  • RULER

  • PROTRACTOR

  • DRAWING COMPASS


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