How Eratosthenes Measured Earth With a Stick ·
How Eratosthenes Measured Earth With a Stick
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.com · gnomon shadow · Syene & Alexandria · ~240 BC
Angle
7.2°
Circumf.
—
Step
—
Parallel sunbeams
Syene · 0° shadow
Alexandria · 7.2° shadow
Central angle = 1/50
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.com · How Eratosthenes Measured Earth With a Stick
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.com · How Eratosthenes Measured Earth With a Stick — Interactive 3D Animation | Unseel