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U.S. railroads adopted the Standard Time System on the Day of Two Noons. On Nov. 18, 1883, the Univ. of Pittsburgh s observatory telegraphed railroads at the exact moment of high noon under the 90th meridian line to reset/synchronize their clocks, dissolving the 100+ timezones previously used.
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Fun Fact: U.S. railroads adopted the Standard Time System on the “Day of Two Noons.” On Nov. 18, 1883, the Univ. of Pittsburgh’s observatory telegraphed railroads at the exact moment of high noon under the 90th meridian line to reset/synchronize their clocks, dissolving the 100+ timezones previously used.
Source
en.wikipedia.org
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