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Mark Pennell sits at the helm of his time machine.Mark's Almanac is a 90-second time travel that highlights the world's history from the very serious to the sometimes sublime.

Mark's Almanac for July 19, 2021

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DARIUSZ SANKOWSKI
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PIXABAY

It was on this date in 1977 that Rockwell Collins received the world's first GPS satellite signal. It laid the major groundwork for the technology we use today. And it was on this date in 1985 that teacher Sharon Christa McAuliffe was chosen to become the first private citizen in space. Sadly, the space shuttle Challenger exploded shortly after liftoff in January of 1986, killing all on board including McAuliffe.