Jnd LONGITUDE of ABERDZZK 15^ 



Determination of the Longitude of the Obfervatory at 

 Aberdeen, by Obfervations of the Lunar Eclipfe of i oth 

 September 1783, made at Aberdeen and at Chiflehurft in 

 Kent, ig'^ in Time Eaft of the Royal Obfervatory at 

 Greenwich. 



M 



Id 



O 



N»mes of Spots. 



Ariftvrrchus, 

 Kepler. 

 Copernicus, 

 Manilius covered, 

 Tycho covered, 

 Menelaus covered, 

 Dionyfius covered, 

 Plinius covered, 

 Mare Crifium E. end, 



_ W.end, 



Total darknefs, 



Apparent Time of Obfervation at 



Aberdeen. 



Chiaefiurft. 



h. ' " 



h. ' " 



9 4* 42-5 



9 50 55 



9 44 9-^ 



9 5* 20 



9 54 »-7 



10 a 24 



to 7 35-8 



10 15 30 



10 8 57.8 



10 17 5 



10 10 31.9 



16 19 10 



10 13 46.9 



10 21 38 



10 14 55-9 



10 22 40 



10 25 51.0 



10 34 34 



10 30 53-0 



10 39 45 



10 36 39.0 



10 46 34 



Diff. of Mcr. 



12.5 

 104 



15-3 

 54-2 

 19.2 

 18.1 

 51.1 

 44.1 



43'0 

 52.0 



11-^ 



Sum, 



Mean, 



U- 



Ariftarchus, 

 Kepler, 

 Copernicus, 

 Plato E. end, 

 Tycho E. end, 



^W, end, 



Menelaus, 

 Dionyfius, 

 Plinius, 



Mare Crifiunft- E. end, 

 W.end, 



Sum, 



Mean per egrefe, 



Mean/)«ringrefs, 



h. 

 12 

 12 

 la 

 la 

 la 

 la 

 la 

 la 

 la 



13 

 13 



34 



4.3 



»7 



5-3 



35 



34-4 



3« 



3*^4 



40 



4.4 



41 



5.4 



53 



0.6 



54 45-6 



56 48.6 



7 



10.7 



la 



20.8 



h. ' " \ 



/ 



" 33 5» 

 la yi 26 



9 



. 10 



la 45 52 

 I a 47 22 



12 48 30 



la 49 58 



13 I 40 

 13 3 18 



■ lO 

 8 

 8 

 8 

 8 

 8 



13 5 40 

 13 16 35 

 13 ao 53 



8 



9 

 8 



254-9 



8 a3.i7 



47-7 



26-7 



18.6 

 49.6 



53-^ 

 39-4 

 32.4 

 51-4 

 a4-3 

 32.a 



95.5 

 9 8.68 

 8 a3.i7 



17 31-85 

 DifF. mer. Aber. and Chiflehurft in time nearly, 8 4593 

 Longitude of Chiflehurft in time E. 19. 



Longitude of Aberdeen nearly. 

 Change of equation of time in 8' a6".9 



Longitude of Aberdeen, - 



8 a6.9a 

 .la 



8 36.8 W. 



Deter- 



