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.
The total eclipse will pass through the cities of Minneapolis, Minnesota, Madison, Wisconsin, and Grand Rapids, Michigan. The last total solar eclipse over these three cities respectively was June 30, 1954, May 16, 1379, and April 18, 1558.