Measuring time: Calendars and clocks
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Noting that early time-telling was based on observations of seasons and recurring celestial cycles, animated sequences show how days, years and months are determined by the sun and moon, and how these periods of time, plus the week, are organized into calendar years that keep step with the seasons.
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- 16mm Filmography (legacy record) — title, year, creator, length, format, description, catalog record
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