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jul 29, 1927 - A.A. Michaelson makes most accurate measure of speed of light

Description:

2.990 +/- .0002 x 10^8 m/s | [real is about 3x10^8 m/s] | Based on revolving mirrors at the tops of two California mountains

Added to timeline:

AP US History

10 May 2018

1

0

1632

Date:

jul 29, 1927

Now

~ 98 years ago

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