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.
On Monday, August 21, 2017, all of North America will be treated to a rare celestial event, an eclipse of the sun. Tracing the 2017 Solar Eclipse. Anyone within the path of totality can see one of natureâs most awe inspiring sights - a total solar eclipse.