On this day in Lewis & Clark history...
Clark oversees the building of winter quarters at the Wood River northeast from St. Louis. Lewis is Cahokia working on a letter to President Jefferson describing the various populations in the Louisiana territory.
From the journals...
Took the me[ridian?] altitude of the Suns Lowr Limb with the Sextent found it to be 56° 15' 22", The Chronomter too Slow about 24' 20"— I also took the median altitude of the Suns Lowr limb with the quadt and found 52° 57m 0 the errour of the instrument is 1° 20' 00" + ad +Lat = 38° 21' 36 1/10" Qudt = 38 31 57 1/10
Wood, Missouri, and Mississippi Rivers
Satellite image provided by the U.S. Geological Survey.