Schedule of Observations

Page 2 of 7

Celestial Observations made at
the Mouth of the Marias River
2–10 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
9–10Magnetic 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)