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.
Learn More About the Solar Eclipse. Solar Eclipse Fast Facts: With the internet, this will be the largest astronomical event in US history. The last total eclipses visible in Nashville were July 7, 1442, and July 29, 1478, (right at sunrise) with annular eclipses Dec. 25, 1628, (right at sunrise) and Oct. 19, 1865. The next total eclipse Nashville can anticipate seeing is on Aug. 16, 2566, with 2 minutes and 15 seconds of totality.