ASTRONOMICAL OBSERVATIONS. x54 
The fame undulatory appearance was not feen in the re=- 
fleftor, and therefore the 2d external contaét obferved by 
it, may be more relied upon—The times of our obfervati- 
ons were taken from the fame clock, but noted in different 
rooms—The day was remarkably favourable, being clear, 
and fufficiently calm. 
By D. Rittenhoufe; at Philadelphia, 
Lat. 39°. 57°-.10”. Long. weft of Greenwich 5°. 0’. 35”. 
November, 2d, 1789. Moon eclipfed 
ates f / 
peginnag : oe ‘ P. M. mean time. 
Digits eclipfed, 4= 
Tranfitof Mercury November 5th, 1789. 
Amn = h / li 
Firft external conta = 7" 51' 50 g A.M.) 
fnternale) 725 9a20..05; Meant 
Secondinternalconta&l 12 43 24 PM P vir Nae 
End of the tranfit: .1e-45. gn Qo *oriJ 
‘The undulation of the fun’s limb was fo great that no. . 
micrometer meatfures could be taken with accuracy, but the: 
leaft diftance of the centers feemed to be 7’. 15”. 
October 22, 1790. Moon eclipfed 
Beginning at ; Se Ais} 
Beginning of total darknefs6. 49. 9 i ; 
End of total darknefs 5. 3 16 f bot guia tial: 
End of the eclipfe 9. 37. 25 | 
November 6th, 1790, ‘Sun eclipfed. 
Beginning at LO ii ete Cea 
Bodice Aaa P. M. mean time. 
If this eclipfed be computed from Mayer’s tables it will 
be found advanced 33”, at the time fet down above for the 
beginning, and by Mafon’s new tables 29". And it is cer- 
tain that an eclipfe muft make fome progrefs before it will 
be perceived by the moft attentive obferver. ‘The end was 
no doubt obferved with more accuracy, and at that time. 
Mayer’s ; 
