Measuring Time and Distance
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Discusses natural and artificial means of measuring time and distance. Explains how the three natural divisions of time--day, month, and year--come from the motions of the earth and the moon. Tells how civil time, universal time, and the sidereal time are calculated. Uses charts, diagrams, and photographs to show how distances in space are measured by the speed of light and the magnitude or brightness of the stars. Features James S. Pickering of the American Museum-Hayden Planetarium.
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- 16mm Filmography (legacy record) — title, year, format, genre, description, catalog record
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