Mark Twain said:
I came in with Halley's Comet in 1835. It is coming again next year (1910), and I expect to go out with it. It will be the greatest disappointment of my life if I don't go out with Halley's Comet. The Almighty has said, no doubt: "Now here are these two unaccountable freaks; they came in together, they must go out together."
John Adams and Thomas Jefferson, at times rivals but in old age friends in correspondence, both died on July 4, 1826, exactly 50 years after the signing of the Declaration of Independence.
Walter Cronkite died today, in the midst of the 40th anniversary of the first trip to the moon.
Some scientists say that it's common for even gravely ill people to hang onto life just to make it to a birthday, an anniversary, or a holiday. It seems only fitting for Cronkite to pass on the anniversary of a news story that made him most happy. Even the Google News robot places Cronkite and Apollo 11 next to each other In The News.