The waning of sexual desire is sometimes considered inevitable in a long-term relationship, but it is unclear whether that is truly the case or whether it is a function of age or familiarity. Low sexual desire can often be treated.
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.
Upcoming solar eclipse: August 21, 2017. Total eclipse of the sun. Will mark the first time this century, and the first time since 1979, that a total solar eclipse will cross the lower 48 US states. Will only sweep over the US.