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, fcc.Jtirigce,) 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, 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- 

 piece. 



Dec. 24, 1819. 



The following is a mean of ten lunar distances from Sun, for col- 

 cmatins: the longitude at Engineer Cantonment. 



Dec. 24, 1919. 



Time of observa- 

 tion, P. M. 



1" 53' 43" 

 Barometer 28.85 



Distance of near- 

 est limbs. 



101° 42' 58" 

 Thermomet. 19° 



Index error. 



+ 15' 



