AT THE OBSERVATORY, CAMBRIDGE, MASS. 



439 



DECEMBER 27, 1840 Continued. 



Remarks. 



Four stars of comparison were u=cd on this night: n =13 mag., 1' south nf Mars' centre at 1A. 40m ; ft = 7. 8 mag., BesseMOo; c = 8. 9 mag. ,2 north 

 of Mars ; d =. 13 mag. ? 3 south. The star a was best situated and was most observed, but it was too faint to be well observed. 



Observer, W. C. B. 



Mean by first wire 

 Chronometer fiist . 

 Sid. time . . . 



K. m. s. 

 9 26. SO 

 58. S8 

 8 28.03 



No. of 

 obs. 



18.03 



A. m. 8. 



Mean by second wire . 937.08 

 Chronometer fast . . 58.28 



Sid. lime . .08 38.78 



No. of 

 obs. 



18.02 



Mean by first wire 

 Chronometer last . 

 Sid. time 



h. in. s. 

 57 25.2-2 

 58.28 

 56 26.94 



49.12 



No. of 

 ubs. 



15 



h. m. 8. 



Mean by second wire . 57 39.97 

 Chronometer fast . . 58.28 



Sid. time . . . . 55 41.69 



49.54 



No. of 

 obs. 



15 



Mean by first wire. 

 Chronometer fast . 

 Sid. time . . . 



h. m, 8. 

 1 2 29.12 

 58.28 

 1 1 30.24 



An. 



39.68 



No. of 

 obs. 



13 



A. m. f. 



Mean by second wire . 1 2 43.90 

 Chronometer fast . . 58.28 



Sid. time .... 1 1 45.62 



39.42 



No. of 

 obs. 



13 



Mean by first wire 

 Chronometer fast . 

 Sid. time . . . 



A. m. f. 



57 19.95 



58.28 



56 21.67 



1 6.31 



No. of 

 obs. 



14 



h. m. t. 



Mean by second wire . 57 39.97 

 Chronometer fast . . 58.28 



Sid. time . . . . 56 41.69 



A a. 

 m. f. 



1 6.10 



No. of 

 obs. 



15 



