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.
MONDAY, AUGUST 21, 2017 | Begins: 11:58 a.m., Totality: 1:27 p.m., Ends: 2:54 p.m. On August 21, a rare, total solar eclipse will sweep across the continental U.S. for the first time since 1918, and Nashville will be the biggest city in its path.