Astronomical and Meteorological Records, ^c. xix 



Nov. 27. Index errors of sextant when glasses of different shades 

 were used as skreens before the speculum and horizon glasses, were 

 observed to day, as follows : 



The darkest shades but one, being placed before both reflectors the 

 index error was — 16". 



The lightest shade but one being placed before the horizon glass, 

 and no shade before the index speculum, the index error was, + 

 1' 32". 



The eye glass of the telescope being shaded, and no shade before 

 either of the reflectors, the index error was, + 17". 



On the evening of the 27th Nov. at 5^ 50' 46" per time-piece, 

 (pocket chronometer,) observed an emersion of Jupiter's first satel- 

 lite. The sky very clear, and the belts of Jupiter distinct for the 

 magnifying power of the telescope, to find the longitude. 



Longitude deduced, 6"^ 22' 43" or 95" 40' 45" W. of Greenwich. 



Equal altitudes of Sun to find error of Time-piece, (pocket chro- 

 nometer , J at midnight. 



Time before Mid-, Time after Mid- 



Nov.27, 1819. 



Nov. 27, 1819. 



night. 



9" 33' 49" 

 9 31 28 

 9 29 09 



night. 



9"^ 20' 09" 

 9 17 49 

 9 15 29i 



;} 



Meridian double altitude of ? 

 the star Sirius - 5 



Index error + 17". Lat. deduced 



Error of Time- 

 piece. 



4' 54" 35'" fast. 

 Mean time. 



64° 15' 40" 



41 25 10 N. 



Equal altitudes of Sun to find error of Time-piece, (pocket chrono- 

 meter, J at noon. 



I Time from Noon, 

 A. M. 



Nov. 28,1819. 



2" 44' 30" 

 2 42 12 

 2 39 53 



Time from Noon, 

 P. M. 



2" 29 

 2 27 

 .2 25 



' 44" 1 

 26 } 

 07 J 



Error of Time- 

 piece. 



4' 39" 40'" fast 

 Mean time. 



Equal altitudes of Sun to find error of Time-piece, (pocket chro- 

 meter,) at midnight. 



Time before mid- Time after mid- Error of Time- 

 night, night. piece. 



Nov. 28. 1819. 



gu 34' 57" 

 9 32 34 

 9 30 13 



9" 21' 59A" 

 9 19 

 9 17 



591" ^ 



38 Y 

 16| J 



5' 00" 15'" fast. 

 Mean time. 



