gaseous ammonia is generally referred to as anhydrous ammonia to distinguish it from household ammonia, which is an ammonium hydroxide aqueous solution. gaseous hydrogen chloride is generally referred to as anhydrous to distinguish it from the more commonly used 37% w/w solution in water.
20th century. The total solar eclipse of June 8, 1918 crossed the United States from Washington State to Florida. This path is roughly similar to the August 21, 2017 total solar eclipse and was the last time totality crossed the nation from the Pacific to the Atlantic.
This will be the first total solar eclipse to touch the United State since 1991 when one occurred in Hawaii, and the first coast-to-coast across the southern U.S. since 1918. The last time a total solar eclipse occurred in the greater St. Louis area was 1442. St. Louisans can expect the next one in 2505. Eclipse-chasers from around the world are expected to converge in St. Louis and the areas beyond as about half of both Kansas City and St. Louis lie within the patch of totality.