A sundial shows the current solar time during the day. It does this because the sun appears to move through the sky. At different times in the day when the sun is shining, a shadow is cast in different places on the dial. A person marks the dial with the time at a certain shadow. This lets users easily see the time. There are a few commonly seen designs, such as the 'ordinary' or standard horizontal garden sundial. However, sundials can be designed for any surface where a fixed object casts a predictable shadow. They may be horizontal or vertical or tilted.
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- Sunbeams and Sundials Children's guide to the sun, the seasons and sundials.
- There is a book from 1319 that talks about sundails
- There is another old book from the 1500's that talks about how to make a sundial. It's written in the Arabic language