Jespersen, James. From sundials to atomic clocks : understanding time and frequency / James Jespersen and Jane Fitz-Randolph ; illustrated by John Robb.

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Jespersen, James.

From sundials to atomic clocks : understanding time and frequency / James Jespersen and Jane Fitz-Randolph ; illustrated by John Robb.

Time.

Time measurements.

Clocks and watches.

Fitz-Randolph, Jane.

Robb, John.