Jnd LONGITUDE of ABERDEEN. 



139 



Having the follov?lng obfervations of fixed flars reduced, I 

 have alfo fent them. 



Obferved Diftances of Fixed Stars from the Zenith of the Obfervatory. 



l-]U. 



Bar. 



T.. 



Name of Stars. 



Zen. dift. 



Error 

 Quad. 



Mean 

 Ref. 



True 

 Rcf. 



r. Zen. dift. 



M. Declina. 



Ab. 



Nut. 



ApplDecl. 



Latitude. 



11 June 22. 

 5 Sept; I. 

 § 0<5t. 25. 

 If — 26. 

 7j Dec. 2. 

 — *4. 



? -27- 



29.82 

 29.49 



30-37 

 30.42 

 29.50 

 2993 



^8.95 



55 

 55 

 44 

 44 

 37 

 24 



36 



Ar(n:urus 

 a Lyra. 

 Altair. 



i6» 50' 14" 



'8 32 37 

 48 48 31 

 48 48 29 

 31 I 



87 35 I* 



88 I 23 

 I 46 47 



+ 3" 



I 



5 

 S 

 2 



I 

 I 



o'43" 



19 



1 S 

 I s 



34 

 2 

 2 

 a 



o'4 3" 



19 



1 8 

 I 8 

 35 



3 2 

 3 2 



2 



36° 51' 0" 



18 3^ 57 

 48 49 44 

 48 49 42 

 31 " 37 



87 35 13 



88 I 24 

 I 46 48 



20« iS' 2" 



38 35 45 

 8 19 20 

 8 19 20 

 83 ro 8 

 59 33 S3 

 59 7 12 

 55 51 59 



4- 6" 



1(5 

 — 9 



+ .? 



17 

 16 

 16 



~ 7" 

 + 8 

 

 

 7 

 3 

 5 

 3 



20" 18' 1" 

 8 i<i 9 

 8 19 II 

 8 19 II 



88 10 32 

 59 34 13 

 59 7 33 

 55 5« 19 



57° 9' I" 

 57 9 6 

 57 8 ss 

 57 8 S3 

 57 8 55 

 57 9 

 57 8 57 



57 9 7 



Pole Star. 



7 Cafs. arc Excefs. 



<r Caffiopeia. 



a. Caffiopeia. 



Latitude, 



The declinations of the above ftars were taken from M. de 

 LA Lande's catalogue of the declinations of 350 ftars, adapted 

 to the beginning of the year 1 790. 



I shall conclude by obferving, that the differences in the 

 above latitudes are to be attributed to the error of obfervation, 

 to the inaccuracy of the divifion of the quadrant, and to the un- 

 certainty of the refradlion, efpecially at low altitudes. If the re- 

 fradlion at 45° be aflumed a little greater than that by Dr 

 Bradley, the refults will agree much better. It muft alfo 

 be obferved, that the fmoke of the town will increafe the refrac-> 

 tion. 



S7 8 S9i 



I am,. 



Dear Sir, 



Your obedient fervant, 



Andrew Mackay. 



R 2 



L E T^ 



