From the Vault: Stargazer and the Well
Stuff To Blow Your Mind
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The History of the Paris Observatory
The Paris Observatory founded 1667 through 1675 featured a vertical hole which via the caves below formed a 55 meter deep well. Cassini apparently used the well himself and had another well built. But around this time, Saale says astronomical advancements may have made venturing down into a well just increasingly obsolete.
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