On this day in Lewis & Clark history...
Lewis and Clark spend the day at Fort Massac near present Metropolis, Illinois. Lewis attempts to make astronomical observations but must stop when evening clouds obscure the sky.
From the journals...
remained, took equal altitudes A. M. but was prevented from compleating the observation by taking an observation in the evening by the clouds—
Fort Massac on the Ohio
Pencil on paper sketch by Karl Bodmer circa 1833.