Sundial

Learning objectives

To illustrate a famous application dealing with the straight-line path of light.

The Earth moves around the sun but, in our terrestrial frame of reference, the sun seems to move around the Earth. This periodic motion is the basic principle underlying the sundial. The shadow cast by the “gnomon” indicates the hour of the day.

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Sundial

Learning objectives

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The Origin of Calendars

Mechanical clock

The clock

Year, month, week, day