數位日晷
數位日晷是一個時鐘,它經由照射它的陽光,以數位顯示當時的時間。如同傳統的日晷一樣,這種裝置完全是被動的,不包含任何活動的部位。它不使用電池,也沒有任何其它的能量來源。數值的變化由太陽在一天中的位置來推動。
參考資料
- US patent belongs to HinesLab Inc. (USA)
- Ian Stewart, Scientific American, 1991, pages 104-106, Mathematical Recreations -- What in heaven is a digital sundial?.
- Sundial park in Genk, Belgium
- US and German patent belongs to Digital Sundials International
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