620 PHILOSOPHICAL TRANSACTIONS. [aNNO 1723. 



disappeared, till 14^ 49"^ 10% when the cloud beginning to break, I got time 

 to measure with the micrometer, the lucid parts, now recovered in the moon's 

 diameter, which I found J 4', though this not so well as I could wish, by reason 

 of a thinner sort of cloud which perpetually intercurred, and rendered the edge 

 of the shadow somewhat dubious. 



At 15*^ 15"™ the moon was pretty well got out of the thick cloud, but being 

 very low, and the day-light become strong, she shone very faintly, and the 

 shadow became worse and worse defined. 



From 15** 26™ to 15*^ 27"™ I doubted of the end, and am confident it did not 

 exceed the 27th minute. It ended opposite the north part of the palus maeotis 

 of Hevelius, much about the middle of the western or right-hand limb of the 

 moon, she being then very near setting. 



Capt. Barth. Candler, being then at Port Royal, in Jamaica, had much better 

 fortune, and a serene sky from the beginning to the end, who having used due 

 care to be assured of his times by altitudes taken with an instrument of 3 feet 

 radius, was pleased to send us the result of his observation as follows: 



The eclipse began 6^ 59"™ 10' 



Immersion 8 7 50 



Emersion 9 11 O 



The end 10 1 9 40 



Whence the middle 8 39 25 



And supposing the eclipse to have ended at Greenwich, at 15^264-'", the 

 difference of longitude between Port Royal and Greenwich, will be 5*^ 6"" 50*, 

 or 5*^ 6^"" from London, that is 7&^ 374-'. 



Mr. Kirck, being in a more easterly meridian, could see nothing of the 

 emersion, but as carefully noted the time of the beginning and immersion, as 

 he observed them at Berlin, viz. the beginning of the eclipse at 12'' 59"* 55% 

 and the immersion at 14^' S'" 8^ Now by comparing several observations made 

 at both places, we have formerly concluded Berlin to be 64"™ of time, or 13-i-° 

 of longitude, more easterly than London; therefore at London it began at 12*^ 

 5" 55% and immergeo at 13^ 14™ 8% that is, the beginning was later here 

 than at Jamaica 5*" 6"™ 45% and the immersion later 5^ 6"™ 18% punctually 

 agreeing with what resulted from my own observation of the end, as abovesaid ; 

 and sufficiently with what I had long since determined from observations sent 

 me from Jamaica by my old astronomical friend Mr. Charles Boucher. 



The Longilmle of Carthagena in America. By the same. N° 375, p. 237. 



Having lately received a packet of observations from Carthagena in America, 

 made by Colonel Don Juan de Herrera, chief engineer of that city, I find 

 among them one immersion of the first satellite of Jupiter into his shadow. 



