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.
Last time a total solar eclipse was seen in Wyoming was February 26, 1979. Totality passed over Washington, Oregon, Idaho, and Montana, with near totality (magnitude 0.988) visible in Wyoming. This will be the first solar eclipse to move across the entire mainland of America since June 8, 1918.