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...
Novr. 15th
took equal altitudes A. M. 8 59 6— lost the afternon from clouds which interveened and prevented them
Sextant
