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.
NASAComing soon-Great American Eclipse of 2017. The total solar eclipse will reportedly occur on August 21, 2017. The phenomenon is called the Great American Total Solar Eclipse.. According to sky enthusiasts, the upcoming solar eclipse will be the first one that is totally visible in the US after almost 40 years.