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.
Update: As of today (May 30 2012) the next total solar eclipse will be on November 13, 2012. The path of totality will include the northern tip of Australia and a vast swath of the South Pacific Ocean. The next total solar eclipse in North America will be on August 21, 2017.