First Atomic Clock, 1948

First Atomic Clock, 1948 (HM23WF)

Location: Washington, DC 20008
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Country: United States of America
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N 38° 56.524', W 77° 3.745'

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IEEE Milestone

IEEE Milestone

First Atomic Clock, 1948


The first atomic clock, developed near this site by Harold Lyons at the National Bureau of Standards, revolutionized timekeeping by using transitions of the ammonia molecule as its source of frequency. Far more accurate than previous clocks, atomic clocks quickly replaced the Earth's rotational rate as the reference for world time. Atomic clock accuracy made possible many new technologies, including Global Positioning System (GPS).

August 2017


IEEE
Details
HM NumberHM23WF
Tags
Year Placed2017
Placed ByInstitute of Electrical and Electronics Engineers
Marker ConditionNo reports yet
Date Added Monday, December 18th, 2017 at 7:01am PST -08:00
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Locationbig map
UTM (WGS84 Datum)18S E 321257 N 4312370
Decimal Degrees38.94206667, -77.06241667
Degrees and Decimal MinutesN 38° 56.524', W 77° 3.745'
Degrees, Minutes and Seconds38° 56' 31.44" N, 77° 3' 44.7" W
Driving DirectionsGoogle Maps
Area Code(s)202
Closest Postal AddressAt or near 4000 Connecticut Ave NW, Washington DC 20008, US
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