Google Doodle honors first measurement of the speed of light

Why Evolution Is True

Somehow I missed this anniversary, and the Google Doodle shown below isn’t visible from the U.S. Here’s the skinny from CNet:

While my car has trouble going over 65 mph, the speed of light is much faster — approximately 186,282 miles per second. How do we know that? Well, we can all thank Danish astronomer Olaus Roemer.

To honor Roemer and the 340th anniversary of the determination of the speed of light, Google made a Doodle.

Roemer determined the speed of light in 1676 by observing the planet Jupiter eclipsing its moon Io 140 times. His measurements were taken from Copenhagen while his peer Giovanni Domenico Cassini took measurements of the same eclipses in Paris. Roemer compared the results to determine the speed of light.

In the Google Doodle, you see Roemer repeatedly and thoughtfully pacing back and forth after viewing his telescope. This simple illustration shows just how…

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