The perception of time -- The day: a natural unit of time -- The lunar month: a natural unit of time -- The year: a natural unit of time -- The hour: a logical unit of time -- Time around the earth -- Calendars: a human invention.
Summary:
How do humans perceive time? What are the three different kinds of days? What is a shadow clock and how does it work? Using easy-to-find materials, you can conduct these fun and simple experiments to learn about the science behind time and how it has been measured throughout history.-- Source other than Library of Congress.
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