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| digital sundial ： ウィキペディア英語版 |
digital sundial
A digital sundial is a clock that indicates the current time with numerals formed by the sunlight striking it. Like a classical sundial, the device is purely passive and contains no moving parts. It uses no electricity nor other manufactured sources of energy.
The digital display changes as the sun advances in its daily course.
==Technique==
There are two basic types of digital sundials. One construction uses optical waveguides, while the other is inspired by fractal geometry.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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