August 2011
Beginner
256 pages
8h 15m
English
Content preview from The Manga Guide to the Universe
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20 Prologue A Tale That Begins onthe Mn
In Ancient Greece, Where the Size of Earth Was
Calculated
The ancient Greeks tried to explain the shape of the universe by using the logical thinking
that permeates modern mathematics and physics. One of their greatest achievements was the
discovery that Earth is a spherical body floating in space. The ancient Greeks were also the
first to calculate the size of Earth.
Eratosthenes (who lived from about 276 BC to 195 BC) was a Greek scholar who was
active in Egypt during the Hellenistic period. He calculated the size of Earth using the fol-
lowing method.
Eratosthenes' Calculation Method
Eratosthenes disc ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.