A substance is anhydrous if it contains no water, for example, salts lacking their water of crystallisation. The way of achieving the anhydrous form differs from one substance to another.
A partial solar eclipse at its peak at 3:37 p.m. in Mesa on Oct. 23, 2014. The eclipse was visible over most of North America and covered 44 percent of the Arizona sun. Michael Chow/The Republic.
Solar Eclipses | Lunar Eclipses. 21 Aug 2017 â USAâs first total solar eclipse since 1979. This eclipse will be the first total solar eclipse visible from mainland United States since 1979. Totality will be visible in many cities from East Coast to West Coast.