 | June 22, 2007 | Welcome HI  |  | | |  |  | |  |  |  |  |  |  |  |  | What's so important about this date? Well, it turns out that something interesting has happened on just about every date you can name. Here's yesterday's ...
Earth's Waistline June 21, 240 B.C: Applying trigonometry to the angle of shadows cast by a stick at high noon on the summer solstice at two points separated by a known distance, Greek scientist Eratosthenes comes up with an impressively accurate measurement for the circumference of the Earth.
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