In this stunning astronaut photo, a rare "sunglint" transforms the Mediterranean Sea’s surface into a swirling, silver mirror surrounding a pair of Greek islands — Milos (center) and Antimilos ...

This is one of very few Roman mirrors of this type known from anywhere in the Roman Empire. A slave would have held the mirror by the ornate handles so that the lady could view her face in the ...

With this sextant, one of the mirrors ( mirror A in the diagram) is half-silvered, which allows some light to pass through. In navigating, you look at the horizon through this mirror. The other ...