2008.04 Circle of the Earth 

Article Summary:
What did Pythagoras, Eratosthenes, and Christopher Columbus have in common with the prophet Isaiah? All knew the earth was a globe. This article covers the history of knowledge about the shape of the earth and describes a simple way to calculate its circumference.

Click 2008.04 Circle of the Earth
to view as a PDF and/or to download.

Tags: earth, shape, mathematics, sphere, trigonometry, geography, Pythagoras, Columbus, globe, Pythagorean Theorem, Eratosthenes, Posidonius, circumference of the earth

©William T. Pelletier, Ph.D.
April 2008

Do you not know?
Have you not heard?
Has it not been told you from the beginning?
Have you not understood since the earth was founded?
It is He who sits above the circle of the earth, and its inhabitants are like grasshoppers. He stretches out the heavens like a curtain and spreads them out like a tent to dwell in.
(Isaiah 40:21-22)

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2008.03 Eyewitness to Jesus 2008.05 Age of the Earth 1 — Essentials

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