222 



ASTRONOMY 



TABLE. G. 



Tabulation of results for longitude of astronomical station near moutJi of llio Grande^ derived from 

 observations made iviih 4Q~inch transit (by Troughton & Siinms) and loith sidereal chronometer 

 No. 24:4:0 y (Parkinson & Frodsliam :) By O. G. Gardner and J. H. Clarh^ under the direction of 

 Major W. S, Emory ^ Chief Astronomer and Surveyor of United States and Mexican boundary 



survey. 



• 



§ 



I 



Moon's limb observed. 



! 



Longitude west of Greenwich, de- 

 duced from corresponding obser- 

 vations made at— 



Adopted values of the 



i 



observations for each 

 night. 



Date of observation. 



Moon's liuib observed. 



1 

 1 



Longitude west of Greenwich, de- 

 duced from corresponding obser- 

 vations made at— 



lues of the 

 )ns for each 



1 



Q 



Greenwich 

 Observatory. 



Radcliffe 

 Observatory. 



\ 

 1 



Phila.High 

 School Ob- 

 servatory. 



Greenwich 

 Observatory. 



1 



Eadcliffe 

 Observatory. 



1 

 ] 



Phila. High 

 School Ob- 

 servatory. 





1853, 



A.iif;. 12 



1st 



1 



6A. 28m. 



35.04 

 40.00 

 35.91 



39.85 



29.28 



20.69 



22.33 



14.71 



37.27 



27.22 



33.54 



32.10 



30.23 



30.48 



37,08 



37.19 



30.72 



24.60 



29.69 



38.86 

 1 



1 



6/t. 28m. 



6A. 28m. 



1 



c. 



s. 



35.04 

 40.00 



35.91 

 39.85 

 29.28 

 20.69 

 89.57 

 14.71 

 99.07 

 27.22 

 33.54 

 32.10 

 30.23 

 91.68 

 37.08 

 37.19 

 78.44 

 24.60 

 101.75 

 38.86 



1853. 



Oct. 10 

 12 

 13 

 17 

 18 

 19 

 20 

 21 



Nov. 7 



1 



8 

 9 



10 



11 



1 12 



13 

 14 

 15 

 18 

 21 

 23 



1 



i 



1 



1st & 2d. 



6A. 28w, 



5. 



40.56 

 24.11 

 20.87 

 25.89 

 20,69 

 24.86 



42.03 



41.25 



36.94 



34.05 



32.15 



26. S3 ! 



23.32 



34.55 



35.93 



33.60 



98,41 



28.67 



29.45 



26.91 



6/^. 28m. 



■ 



6/t. 287n. 



5. 



s, 



40.56 



13 









24.96 



i 28.00 



1 



34.37 

 24.09 

 27.56 



74.03 



15 



X 



* 



J 



76,87 



16 









94.63 



17 





i 





68.87 



18 









79.98 



19 





33.62 



1 





42.03 



20 









41.25 



21 





35.90 







36.94 



@9 





1 



34.53 

 30.50 

 31.07 





68 58 



23 



- 







69.65 



24 









57 30 



Sept. 12 









23.32 



13 





30.60 







34.55 



34 







35.93 



15 







30.44 





64 04 



16 





23.86 





28.41 



17 









28.07 



18 





36.03 







29.45 



Oct. 9 









26.91 













f^^r T^ V ^^^ ^^ 



Sum of " Adopted values of the observations t'or each night," 

 Number of observations giving to each its value* , , 



1951.78 

 64 



30.48 



Longitude of astronomical station near mouth of Rio Grande, wegt of Greenwich Observatory 



Probable error 



A. m. s. 

 6 28 30.48 

 ± 0.56 



XoTE.— Radcliffe Obsen'atory is 5m. 02s. 60 west of Greenwich, (Rad. Observations, vol. XIV, page IX;) High School Observatory, Philadelphia, is 

 5A. QOin. 37s. 56 west of Greenwich Observatory. In reducing tlie results from the RadclifFe and High School observations to Greenwich Observatory, 

 the above differences of longitudes have been applied. v 



* In the column, "Adopted values of tlie observations for each night," the results have been obtained by giving double weight to the High School 

 observations, on account of itd relative distance from mouth of Rio Grande, an^qual weight to Radclifle and Greenwich observations. 



