THE ORBIT OP NEPTUNE. 



§ 26. Corrections to the ohserved iwsitions in order to render tliem strictly com- 

 parable loith each other. 



These corrections liave been derived from a comparison of the positions of the 

 ten fundamental clock stars, from y Aquilae to a Ceti inclusive, given by obser- 

 vations at the different observatories, with the adopted standard positions. The 

 standard right ascensions are those of Dr. Gould, prepared for the United States 

 Coast Survey. The declinations are those of Wolfers in the " Tabulos Reduc- 

 tionum," diminished by 0".50. Both are given in the following table : 





R. A. 1850.0. 



Annnal 

 vav. 1850. 



Dec. 1850.0. 



Annual 

 var. 1850. 



Cor. to Am. Eph. 1 



R. A. 



Dec. 





h, m. s. 



s. 



/ " 



„ 







7 Aquiloa, 



19 39 7.68 



+ 2.853 



+ 10 15 5.02 



+ 8.41 



+ 2 



2 



a Aquilfe, 



19 43 27.82 



2.928 



+ 8 28-33.45 



9.13 



— 1 



+ 5 



ji Aquila;, 



19 47 56.67 



2.948 



+ 62 8.68 



8.62 



+ 3 



+ 5 



a^ Capricorni, 



20 9 43.69 



3.835 



— 13 20.90 



10.77 



+ 2 



+ 13 



a Aquarii, 



21 58 4.68 



3.084 



— 1 2 47.41 



17.28 



+ 4 



+ 8 



a Pegasi, 



22 57 17.60 



2.983 



+ 14 23 57.36 



19.30 







+ 1 



a Andromedoe, 



88.57 



3.085 



+ 28 15 43.72 



19.91 



+ 2 







7 Pegasi, 



0^ 5 30.99 



3.081 



+ 14 20 57.67 



■ 20.04 



+ 2 



+ 1 



a Arietis, 



1 58 43.04 



3.364 



+ 22 44 1.97 



17.29 



+ 1 







a Ceti, 



2 54 26.58 



+ 3.130 



+ 3 29 52.45 



+ 14.42 



+ 6 



+ 5 



In reducing the Albany observations, it was found advisable to add w Piscium to 

 the number of standard stars for determining these corrections. Its assumed 

 position is 



R. A. 1860.0. 



23 51 7.42 



Declination 1860.0. 

 + 6° 5' 17".9 



The observed mean right ascensions and declinations of these stars, reduced to 

 the beginnings of the several years, have been compared with those derived from 

 the above table, giving the result from each star a weight proportional to the 

 number of observations when the observations were few in number, but giving 

 each result equal weight when they were numerous. Thus the following sys- 

 tematic corrections have been derived : 





Greenwich. 





Cambkidoe. 





Washington 







R. A. 



Dec. 





R. A. 



Dec. 





R. A. 



Dec. 



18 !0 



+ 0.044 



— 0.04 



1846 





-1.21 



1846 



+ 0.034 



— 0..34 



47 



+ 0.059 



— 0.19 



47 





-0.99 



47 



+ 0.057 



— 0.41 



48 





+ 0.08 



48 





— 0.25 



48 



+ 0.08G 



— 0.57 



49 

 50 





— 1.51 



— 0.52 



49 

 50 



— 0.038 



— 0.05 



— 0.80 



49 1 



50 J 



+ 0.039 



— 1.04 



51 



— 0.020 



— 0.22 



51 



— 0.052 



— 1.17 



61 



+ 0.058 



— 0.89 



52 





+ 0.21 



52 





— 0.20 



68 





— 0.09 



54 

 55 





+ 0.18 

 + 0.05 



53 

 54 



— 0.044 



— 0.75 



— 0.73 



64 





— 1.37 



56 



— 0.038 



+ 0.30 

 + 0.48 



57 



— 0.052 



























GO 



— 0.005 

















01 

 GY. Cat. 



— 0.003 



+ 0.24 

 + 0.63 

 + 0.27 















P.\RIS. 



AlB.\NY. 1 





s 



„ 





s 



n 



of 1854 



— 0.020 





■ 1856 



+ 0.020 



— 0.57 



1861 



+ 0.006 



+ 0.17 



7 Y. Cat. 







58 



+ 0.021 



— 0.23 



62 



000 



0.00 



of 1860 



+ 0.002 





60 



+ 0.023 



— 0.53 



03 

 04 



000 

 000 



+ 0.78 

 + 0.97 



