. Account of an expedition from Pittsburgh to the Rocky Mountains, performed in the years 1819 and '20 : by order of the Hon. Calhoun, sec'y of war: under the command of Major Stephen H. Long. From the notes of Major Long, Mr. T. Say, and other gentlemen of the exploring party. Indians of North America; Discoveries in geography; Indians of North America. Astronomical and Meteorological Records^ ££?c. xxiii Dec. 20, 1819. An emersion of Jupiter's first satellite was ob- served at 6" 03' 15" P. M. per box chronometer. Some flying clouds. Sky about Jupiter clear. Error and rate of
. Account of an expedition from Pittsburgh to the Rocky Mountains, performed in the years 1819 and '20 : by order of the Hon. Calhoun, sec'y of war: under the command of Major Stephen H. Long. From the notes of Major Long, Mr. T. Say, and other gentlemen of the exploring party. Indians of North America; Discoveries in geography; Indians of North America. Astronomical and Meteorological Records^ ££?c. xxiii Dec. 20, 1819. An emersion of Jupiter's first satellite was ob- served at 6" 03' 15" P. M. per box chronometer. Some flying clouds. Sky about Jupiter clear. Error and rate of Time-piece computed agreeably to the results before stated : to find the longitude. Longitude deduced 6" 22' 42" 22"', or 95° 40' S5i" W. from Greenwich. Equal aitititdes of Capella, ,) to find the error of hox chronometer at the time of CapelWs transit over the meridian. Time after transit by astronomical account. Time before tran- sit by astronomi- cal account. Dec. 23, 1819. 7" 12' 54" 101° 21' 26" 14" 32' 02' Chronometer slow for mean time, 0 3 21 Double altitudes of Capella. The foregoing is a mean of seven observations. Dec. 23, 1819. An emersion of Jupiter's second satellite was ob- served at 6" 32' 25" P. M. per Time-piece, (box chronometer.) Sky very clear.—Belts of Jupiter distinct. Thermometer 1° below zero, of Fahrenheit's scale. Error and rate of Time-piece to be estimated as before;—to find the longitude. Longitude deduced G^' 22' 33", or 95° 38' 15" W. of Greenwich. Equal altitudes of Sun to find error of Time-piece, (box chrono- meter,J at noon. Time from Noon, Time from Noon, Dec. 24, 1819. A. M. 2" 40' 13i" 2 37 48 2 35 22 P. M. 2^ 31' 10 2 28 44. 2 26 18 f] Error of Time- piece. 4'17" 30'" slow. Mean time. Equal altitudes of Sun to find error of Time-piece,) box chrono- meter,) at midnight. Error of Time- Dec. 24, 1819. The following is a mean of ten
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Keywords: ., bookauthorad, bookcentury1800, booksubjectdiscoveriesingeography
