108 ASTRONOMICAL Aw» 
‘At 12* I meafared the fun’s horizontal diameter with an ob- 
.je&-glafs micrometer, fitted to a reflecting telefcope, and by a 
mean of five obfervations found it 31” 54’". At 1^ 34’, the 
‘obfcuration was the greateft : The lucid part of the fun was: 
‘then 19° 9"; whence, the greateft eclipfe was 4 digits 48‘. 
;15. Obfervations of a lunar eclipfe, September 10, 1783, at 
Cambridge. 
The moon rofe behind a *cloud that lay along the horizon. 
At 17% 20. d. faw her totally eclipfed. ‘The eaftern part was of 
that d ufky copper-colour which is ufual in total eclipfes : But 
the weftern part was fo obfcure as to be. almoft invifible, except 
a circular appearance of light round her limb, At 7* 27", the: 
| Sends broke away, and I had a good obfervation of the 
and of total darknefs at | | Oral’ 53m 
dá a few minutes the moon was again obícured by clouds & 
i But at Sh 15%, the difperfed and left a very clear fky ;. after 
which I mac lei the fóllowing obfervations : 
Mave Serenitatis wholly emerged, - 
Mare Tranquillitatis wholly onde 
Mare Crifi: um begins to appear, — 
SEPT, "Bifened, 
ets oly cl 
gd dt dee ipfe, 
„Thet DEERAS were taken with an: achromatic leícope. 
mag 6.99.7 times : But ue Madow did not. LM isu od ^ e 
(«Mr Me en. „wih a dedi wap ifying 
