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On this day in Lewis & Clark history...

From a location on the Mississippi River west of Kaskaskia in present Illinois, Lewis measures the angles of the North Star and the stars Aldebaran and Regulus. He records their distances between 10:51 pm and 1:20 am.

From the journals...

On the Mississippi 3 miles W. of Kasskasskais made the following observations— By Circumpherenter— Azamuth of pole Star 7° 47' 00" at 8 h 11 m 45 s P. M. Pr. Chronometer
Moon & Aldeberan Star symbol W.

Time 	        Distance
h     m     s 	 
10    51     8 	60°    57'    45"
11     4    52 	61      1      0
11    15     5 	61      5      0
11    20    50 	61      5     15
11    24     4 	61     10      0
11    27     7 	61     10     45

Meriwether Lewis

North Star, Polaris

Time lapse photo centered on the North Star

Photo by Eneas De Troya, downloaded Wikimedia and used with permission of the Creative Commons 2.0 License.