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Taking Measure

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pair of feet standing on either side of the prime meridian in Greenwich, England

Everyday Time and Atomic Time: Part 4

Judah Levine
This is part 4 in a series. Read part 1 , part 2 and part 3 . Greenwich Mean Time In the previous essay I introduced mean solar time, which averaged the annual variation in apparent solar time so as
wood pendulum clock hung on a wood paneled wall

Everyday Time and Atomic Time: Part 3

Judah Levine
This is part 3 in a series. Read part 1 and part 2 . Oscillators and Clocks In the previous essay, I introduced the ideas that frequency and time interval are closely related concepts, and that the
pipe organ

Everyday Time and Atomic Time: Part 2

Judah Levine
This is part 2 in a series. Read part 1. A short history of frequency Frequency was originally considered to be the province of musicians. The pitches or frequencies of the notes in a musical scale
NIST physicist Judah Levine with the NIST time scale, a digital clock face reading 14:33:34 and a bank of atomic clocks.

Everyday Time and Atomic Time: Part 1

Judah Levine
As a physicist in the National Institute of Standards and Technology (NIST) Time and Frequency Division, I have worked in the general area of operating atomic clocks and using output signals from them

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