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I just received, in my account, $750 for assistance from #FEMA. -
TIL how a #sextant works..TIL how a #sextant works..
You look through the small telescope to a 1/2 silvered mirror you can see through where you place the horizon.
Then you adjust a small mirror above to a known object like the sun or a star until it reflects and lines up on the bottom mirror and read the angle at the bottom.
Mind Blown:
When Apollo 13's systems went down, they calculated re-entry with a sextant.