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.
Aug 21, 2017. 1  A total solar eclipse crossing the U.S. from coast to coast is drawing the attention of millions of Americans on Aug. 21, but when was the last total solar eclipse? The answer depends on where you are.