45 



OBSERVATIONS FOR LATITUDE, CHEYENNE, WYOMING TERRITORY. 



Recapitulation. 



For October i, 1872, 26 pairs give 41 7 46.377 



3, 35 " 46.277 



8, 38 47-105 



9, 35 46.531 

 10, 38 46.371 



" n, 41 " 46.656 



" 12, 44 " 46.902 



Latitude, north, 41 7 46.62 



Giving the first series half-weight on account of the smaller number of the observa- 

 tions and the less favorable condition of that night's work, the resulting latitude, and 

 the one adopted for this station, is, 41 7' 46". 62, with a probable error of o".o8. 

 The latitudes were originally computed by Professor William A. Rogers, of Cambridge, 

 Mass., and revised by Dr. F. Kampf. 



(16.) RESULTING ASTRONOMICAL CO-ORDINATES. 



Taking the longitude of the Salt Lake observatory to be 2 b 19 2 2". 74 west of 

 Washington by determination of the United States Coast Survey, and Washington 

 to be 5 h 8 m 1 2 s . 1 2 west of Greenwich according to the report of Rear- Admiral B. F. 

 Sands, Superintendent of the United States Naval Observatory, October 6, 1871, 

 Cheyenne is in longitude west from Washington, in time, i h 51 3*.3O ; in arc, 

 27 45' 49".5o; in longitude west from Greenwich, in time, 6 h 59 I5 8 42; in arc, 

 104 48' 5i".3o; in latitude, north, 41 7' 46".62o".o8. 



This final result for longitude is subject, as already stated, to a correction for the 

 personal equation of the observers. It is possible, also, that the longitude of Salt 

 Lake may be changed when the observations made last October at Detroit and Ogden 

 by the United States Lake Survey and your expedition respectively are computed. 

 In such an event, of course the longitude of Cheyenne will be correspondingly affected. 

 Respectfully, yours, 



JOHN H. CLARK. 



Lieut. GEO. M. WHEELER, 



Corps of Engineers, in charge. 



