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.
First Total Eclipse in USA Since 1979. This is the first total eclipse of the Sun visible from all 48 contiguous United States (excluding Alaska and Hawaii) since 1979. The last time a total eclipse was visible from coast to coast was in June 8, 1918.