Good morning, CoSoNauts ... T+12 hours, no side effects so far from the bivalent booster. When I had my first shot, the butt-kicking began at T+15 hours, so we'll see ...

In the next message, a little Space trivia ...

Ever wonder what the "T" stands for when we space biz people say, "T minus 60 seconds ..."?

The T stands for Time!

It goes back to the 1950s, when both the Air Force and the Army were at Cape Canaveral firing test missiles. The USAF used T for Time, but the Army used X! Wernher von Braun was with the Army at that time; perhaps the X went back to the V-2 tests at Peenemunde.

Eventually the USAF took over missile tests, von Braun went to NASA, and the X went away. We were left with T. ๐Ÿ˜Š

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Here's an example of the use of "X" by the Army ... It's a 1958 documentary about the launch of Explorer 1, the first U.S. satellite, on January 31, 1958. The satellite was placed on a modified Army Redstone called a Jupiter-C or Juno 1, but it's really a Redstone. Anyway,you'll see X used throughout the documentary.

youtube.com/watch?v=roXs-4oD63

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