This reminds me of Aristotle's experiments with wine-soaked cloth, which gradually changes color when exposed to sunlight. He tied such cloth to his student Alexander's wrist, for use in determining the passage of time. It became known as Alexander's Rag Time-Band. ;-)
[EMAIL PROTECTED] wrote: > Have recently heard about a bracelet used in Ethiopia. Apparently worn as > usual and used to roughly determine the suns position in the sky (hour of > day). The bracelet consists of reflective stones that reflect sunlight. > Does anyone know about this and can you provide more information on it?
