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On this day in Lewis & Clark history...

Clark moves the keelboat from the Cahokia landing to a point in present East St. Louis. There, he records celestial observations. Lewis is in St. Louis making careful inquiries as to the population in the Louisiana territories.

From the journals...

At the landing opposite the town of Cahokia, and a little above its mouth took Meridian Altd. of Sun symbol's U. Limb.— found it 57° 46' 30"— the sun was reather dim, therefore it possible that this obsevation may have been liable to a small error—
William Clark

William Clark

Latd. pr. this obstn.— 38° 38' 9"

Meriwether Lewis

Sextant circa 1800

Triangular measuring instrument