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.
Path of Totality. The total solar eclipse of August 21 is the first total eclipse visible from Americaâs lower 48 states in over 38 years. The last one happened in 1979 and passed through the Pacific Northwest and central Canada in late winter. (see: Total Solar Eclipses in the USA)