132 On the North Polar Distances of Fixed Stars. 



M. Bessel's distinguished talents and extraordinary assiduity 

 ought to prevent us from forming any hasty adverse opinion. 

 The question is quite open, and must be decided by the future 

 hibours of astronomers : wliich, it is desirable, should be par- 

 ticularly pointed to the investigation of the constant of refracr 

 tion for both interior and exterior thermometers. The baro- 

 meters and thermometers should, if possible, be compared with 

 exact standards. The results, then, if from sufficiently nume- 

 rous observations, will probably be not very discordant ; and 

 a mean of thon may be adopted for the common use of astro- 

 nomers, by which our tables of refraction and our catalogues 

 will possess an uniformity very different fi'om what we see at 

 present. I am, gentlemen, 



Your most obedient and humble servant, 

 9th Feb. 1823. A. P. T. C. D. 



Differences of 

 adjacent Stars 

 of M. Bessel's 

 Catalogue. 

 A 



Capella . . 

 X Cygni 

 a. Lyrae 



Castor 

 Pollux . . 

 /3 Tauri 



« Androinedae 

 a Cor. Bor. 

 «6 Arietis . . 



Arcturus . . 

 Aldebaran 

 /3 Leonis 



y Pegasi 



Regulus . . 

 cc Ophiuchi 



y Aquilae . . 



ec Orionis . 



a. Serpentis 

 /3 Aquilae 

 Procyon . 



« Ceti . . . 

 u Aquarii . 

 SpicaVirginis 



1 a. Capricorni 

 2oc. 



Siriiis 



Diff. for 

 same stars in 

 Dr. Brink 

 ley's Cat. 



B 



9 40,65 

 1 10,70 



6 20 56,72 



3 49 15,51 

 25,14 



20 53,81 

 46 12,15 



4 43 12,12 



2 28 56,89 

 4 4 8,27 



28 37,12 



1 23 4.3,82 



1 20 22,64 



8 37,92 



2 31 1,69 



1 46 53,28 

 1 2 10,00 



21 



1 2 

 17 



4,00 

 10,52 



2 18 2,65 

 4 34 3,15 

 9 1 42,21 



2 50 17,90 

 2 17,90 



3 22 53,66 



40,10 

 10,11 



57,45 

 15,69 

 24,90 



53,87 

 11,20 

 12,90 



56,80 



8,62 



36,49 



42,82 

 24,26 

 36,49 



1,58 

 53.14 

 11,86 



.53,60 



3,14 



12,93 



2,84 



2,23 



43,05 



16,52 

 17,43; 

 56,06 



Koniiisb. 

 N.P.D. 

 = Dublin. 



+ 0,95 

 1,50 

 2,09 



1,36 

 1,18 

 1,42 



1,36 

 2,31 

 1,53 



l,fl2 



1,27 

 1,90 



2,90 

 1,28 

 2,71 



2,82 

 2,96 

 1,15 



3,40 

 4,26 

 2 42 



2,23 

 3,15 

 2,31 



3,69 

 4,16 

 1,76 



KoniiTsb. 

 N. P.^D. 

 =Dublin. 



D 



-0,01 

 + 0,52 

 + 0,99 



+ 0,13 

 -0,14 

 + 0,10 



+ 0,03 

 + 0,96 

 + 0,06 



+ 0,08 

 -0,39 

 + 0,23 



+ 1,17 

 -0,49 

 + 0,94 



+ 0,96 

 + 1,03 

 -0,83 



+ 1,41 



+ 2,23 

 + 0,38 



+ 0,08 

 + 0,74 

 -0,82 



+ 0,22 

 + 0,69 



- 2,25 



Koni<;sb. 

 N.P^D. 

 =Dublin, 



E 



-0,09 

 + 0,43 



+ 0,89 



+ 0,02 

 -0,26 

 -0,02 



-0,09 

 + 0,84 

 -0,08 



-0,06 



- 0,54 



+ 0,08 



+ 1,02 



- 0,65 



+ 0,78 



+ 0,79 

 + 0,85 



- 1,01 



+ 1,23 

 + 2,04 

 + 0,21 



-0,11 

 + 1,12 



- 1,11 



-0,10 

 + 0,37 



-2,52 



