TTBOOK Presents: Deep Time cover image

Deep Time: The Tyranny of Time

TTBOOK Presents: Deep Time

CHAPTER

The First Atomic Clock

Since the dawn of time, we've measured time effectively by the rotation of the Earth. It was only in the late 20th century that we found a better way of keeping time. The first atomic clock was made of the national physical depolitary and had been used there since 1955 for the accurate measurement of time and frequency. A complete measurement takes a few minutes and the result is accurate to one part of 10,000,.000,000.

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