Schedule of Observations


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	Technology Celestial Navigation Mouth 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
2–10 June 1805

Day	Type of Observation	Number of Measurements and Description

02	Lunar distance from Spica 1	8, angle between the moon and Spica ÷ the time
02	Lunar distance from Spica 2	8, angle between the moon and Spica ÷ the time

03	Equal altitudes of the Sun AM	3, sun's altitude ÷ the time
03	Meridian (noon) altitude of the Sun	1, sun's altitude at its highest daily point in the sky
03	Equal altitudes of the Sun PM	3, sun's altitude ÷ the time
03	Lunar distance from the Sun 1	8, angle between the moon and sun ÷ the time
03	Lunar distance from the Sun 2	8, angle between the moon and sun ÷ the time

09	Magnetic declination using Sun AM	2, altitude and bearing of the sun ÷ the time
09	Equal altitudes of the Sun AM	3, sun's altitude ÷ the time
09	Meridian (noon) altitude of the Sun	1, sun's altitude at its highest daily point in the sky
09	Equal altitudes of the Sun PM	3, sun's altitude and bearing of the sun ÷ the time
09	Magnetic declination using Sun PM	6, angle between the moon and Aquila ÷ the time
09	Lunar distance from Aquila	6, angle between the moon and Aquila ÷ the time
09	Lunar distance from Spica	6, angle between the moon and Spica ÷ the time

9–10	Magnetic decllination using Polaris	3, bearing of Polaris ÷ the time
10	Meridian (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

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From Discovering Lewis & Clark ®, http://www.lewis-clark.org © 1998-2009 VIAs Inc.
© 2009 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)