AT THE OBSERVATORY, CAMBRIDGE, MASS. 

 DECEMBER 18 niicl 19, 1849. 



437 



Remarks. 



Star is 1' north of Mars. 

 Observer, W. C. B. 



N. B The zero of the position circle on the evening of December 18lh and on the morning of the 19lh, was supposed to be 180 0', instead of ita 



true value, 179 55' ; the Right Ascension differences will therefore require a small correction. 



Mean by first wire 

 Chronometer fast 

 Sid. time . . . 



A. m. i. 

 11 49 29 90 

 55.23 

 11 48 31.67 



A a. 



27.51 



No. of 

 obs. 



24 



A. m. f. 



Mean by second wire . 114940.86 

 Chronometer fast . . 55.23 



Sid. time . . . 11 48 45.63 



A o. 



27.59 



No. of 

 obs. 



24 



DECEMBER 



Remarks. 



The star at OA. 30m. is south of Mars' south limb by 47". 

 Observer, O. P. B. 



Mean by first wire 

 Chronometer fast . 

 Bid. time . . . 



A. m. t. 

 14 15.43 

 56. 09 

 13 19.41 



An. 



51.06 



No. of 

 obs. 



18 



A. m. *. 



Mean by second wire . 14 29.24 

 Chronometer fast . . 56.02 



Sid. lime 13 33.23 



An. 



51.02 



No. of 



OlW. 



18 



