35 



Authorities for ^ c, ^th Mag. 



Measures. Meftsures , 



1847, Jan. 1. Konigs'g HelLometer, e, = 328° 12' 30"84 74 e'„ = — 13° 45' 18"43 74 

 Authorities for ^ f= e" Jlquarii, 1th Mag. 



1847. Jan. 1, concluded / = 330 36 36.74 189 /' = — 12 18 55.04 



By Cambridge (Mass.) Equatorial, rf/„= — 1.83 28 (//'„=— 0.07 



By Durham Equatorial, = + 0.29 69 = — 0.90 



By Philadelphia Equatorial, = + 1-51 50 = + 0.65 



By direct Meridian Obs., = + 0.01 42 = — 0.62 



Authorities for * g- = 7740 B. A. C, 1th Mag 



1847. Jan. 1, concluded g = 331 1 51.92 82 g' = — H 49 8.46 61 



By Durham Equatorial, dg^ = + 0.79 61 + 0.00 61 



By Meridian Obs., =+ 2.72 21 



1847. Jan. 1. By Konigs'g Heliometer, * A = 331 18 49.11 3 A' = — 12 40 48.88 3 



" " " * i = 330 5 .39.19 3 i' = — 12 21 32.22 3 



" " « * A: =330 31 0.19 4 A' = — 13 5 9.58 4 



" " " * Z = 330 28 47.89 2 Z' = — 13 9 31.48 2 



No. 45. The other stars used for comparison with Neptune in the equato- 

 rial instruments, have not been determined with sufficient precision to add to 

 the weight of the normal places furnished by the meridian observations, and by 

 the comparisons with these eleven stars. In many instances I have been com- 

 pelled to reduce the Cambridge (England) and Hamburg equatorial observa- 

 tions in the same manner as meridian observations, where several stars have 

 been used, whose names, or weights, or authorities, for mean places are not 

 mentioned. Their comparison with the Ephemeris is given ; but I have not 

 used them in forming the normal Ephemeris, lest the weight of the result should 

 be lessened from the uncertainty concerning the stars' places. 



No. 46. The *equatorial observations with these eleven stars were reduced, 

 by bringing them all to the form of differential observations, and then applying 

 the mean places in No. 44. The next step was to form the normal Ephemeris, 

 by repeating the grouping process of Nos. 42 and 43, giving equal weights to a 

 meridian and to an equatorial night's work, without reference to the number of 

 equatorial measures. I subjoin the final correction of the preceding Ephemeris 



* In reducing the Washington and Philadelphia equatorial measures, I have applied the small correction for the influence 

 of precession, nutation, and aberration, on the result of the measures after Bessel's formulEe, page 208, of his Astrono- 

 mische Untersuchungen. I have not applied it to the other measures, presuming that where it was sensible it has been 

 applied by the observers. — S. 0. W. 



Art. 1. — 5 



