About Time: A First Look at Time and Clocks - Houghton Mifflin Harcourt Publishing Company

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Bruce Koscielniak, in this Common Core text exemplar, tells the intriguing story of the many years spent tinkering and inventing to perfect the art of telling time.
Centuries later, we have Clocks and calendars all around us!.
First they used the sun, the moon, and the water, but soon after people began using their knowledge About the natural world to build Clocks and to create calendars made up of months and years.
Then people started creating tools to measure time.
When Time itself was undefined, no one knew the difference between a minute, an hour, and a day.
Bruce Koscielniak, in this Common Core text exemplar, tells the intriguing story of the many years spent tinkering and inventing to perfect the art of telling time