On this day in 1904 - December 20th - The Mount Wilson Solar Observatory was founded.
About fifteen years later, "solar" was dropped from the name as the 100-inch Hooker telescope came into use. Observing with it, Edwin Hubble found evidence that the Milky Way was just one galaxy in an expanding Universe.
On this day in 2019 – December 22nd – at 04:19 UTC the December solstice occurred, the start of winter in the northern hemisphere and summer in the southern hemisphere.
UTC=Greenwich Mean Time, so for most of North America and the Pacific islands the solstice was on December 21st. The northern winter solstice happens when the Sun is directly above the Tropic of Capricorn.
On this day in 1968 – December 24th – Apollo 8 entered lunar orbit.
The crew were the first humans to view Earth as a whole planet, the first to orbit another world, and the first to see the far side of the Moon. They made a live Christmas Eve broadcast to the Earth as the circled the Moon.
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