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Determine the speed of light, and be honored with a Google Doodle

Google celebrates the 340th anniversary of Olaus Roemer's determination of the speed of light.

340 years ago the speed of light was determined.

Google Doodle

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 much detail and thoughtfulness Google applies to its Doodles.

Check out the Google Doodles archive for even more unique and informative images.