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TechnologyCelestial NavigationMouth of Marias River
A truly remarkeable point
Latitude at the Confluence
 

Schedule of Observations

Page 2 of 7

Celestial Observations made at
the Mouth of the Marias River
210 June 1805

DayType of Observation Number of Measurements and Description
02Lunar distance from Spica 1 8, angle between the moon and Spica the time
02Lunar distance from Spica 2 8, angle between the moon and Spica the time
03Equal altitudes of the Sun AM 3, sun's altitude the time
03Meridian (noon) altitude of the Sun 1, sun's altitude at its highest daily point in the sky
03Equal altitudes of the Sun PM 3, sun's altitude the time
03Lunar distance from the Sun 1 8, angle between the moon and sun the time
03Lunar distance from the Sun 2 8, angle between the moon and sun the time
09Magnetic declination using Sun AM 2, altitude and bearing of the sun the time
09Equal altitudes of the Sun AM 3, sun's altitude the time
09Meridian (noon) altitude of the Sun 1, sun's altitude at its highest daily point in the sky
09Equal altitudes of the Sun PM 3, sun's altitude and bearing of the sun the time
09Magnetic declination using Sun PM 6, angle between the moon and Aquila the time
09Lunar distance from Aquila 6, angle between the moon and Aquila the time
09Lunar distance from Spica 6, angle between the moon and Spica the time
910Magnetic decllination using Polaris 3, bearing of Polaris the time
10Meridian (noon) altitude of the Sun 1, sun's altitude at its highest daily point in the sky

The information derived from the captains' observations listed above is presented in the following sequence:

Latitude

Local Time

Longitude

Magnetic Declination (Variation of the Needle)

Robert N. Bergantino, 11/06

A truly remarkeable point
Latitude at the Confluence


 
From Discovering Lewis & Clark ®, http://www.lewis-clark.org © 1998-2014
by The Lewis and Clark Fort Mandan Foundation, Washburn, North Dakota.
Journal excerpts are from The Journals of the Lewis and Clark Expedition, edited by Gary E. Moulton
13 vols. (Lincoln: University of Nebraska Press, 1983-2001)