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On this day in Lewis & Clark history...

The Captains spend the day determining the latitude and longitude of the Mississippi and Ohio confluence using a sextant and chronometer. Clark records their course using a circumferentor—a surveying compass 6 inches in diameter.

From the journals...

took equal altitudes A. M. 8 59 6—    lost the afternon from clouds which interveened and prevented them

Meriwether Lewis

Sextant

Old triangular navigation device