VOL. XXXII.] PHILOSOPHICAL TRANSACTIONS. 621 



observed there by a telescope of 17-t feet, on April 9, O. S. 1722, at 15^ 58™ 

 44^ apparent time; and two emersions of the same, viz. July 5, 11*^ 23"" 41% 

 and July 21, 9*^ 42"" 17% O. S. all which tally with observations made at Wan- 

 sted by the Rev. Dr. Pound and Mr. Bradley, who observed there the very 

 next eclipses to all the three; viz. the immersion by a 15-foot tube, on April 

 11, 15^28'"40' equal time, or 15*^ 30™ 25' apparent time. And the first 

 emersion, July 7, 10*^ 59™ 28^ equal time by the reflector, and 18' after, or 

 10*' 59™ 46' by the 15-foot glass, that is, 10^ 54™ 12' apparent time. The 

 other was observed at Wansted, July 23, 9^^ 19™ 10' equal time, both by the 

 reflector and 15-foot glass, viz. at 9^ 13™ 35' apparent time. Subtract from 

 each of these one period of this satellite, or 1** 18^ 28™ 36', and April 9, 15^ 

 58™ 44' at Carthagena will be 21^ 1™ 49' of the same day at Wansted, and 

 the difference of meridians 5^ 3™ 5'. Likewise by the first emersion, July 5, 

 1 1^ 23™ 41' at Carthagena, was at Wansted 16^ 25™ 36* of that day, whence 

 the difference of meridians 5^ 1™ 55^. But by the last emersion, July 21, 9^ 

 42™ 17' at Carthagena, was 14^ 44™ 59' at Wansted; whence Wansted is 5^ 

 2™ 42' more easterly than Carthagena; and taking the medium of all three, 

 5^ 2™ 34', or 75° 38', may be taken for the true diflPerence of longitude, that 

 is, 754- from London, which compared with Capt. Candler's observation of the 

 late lunar eclipse, shows Carthagena to be about 20 leagues to the eastwards of 

 Port Royal in Jamaica. 



Observations on a Comet seen at Berlin, from the 18th of January to the 5th of 



February, 1/18, N. S. By Christfried Kirch. N° 375, p. 238. Trans^ 



lated from the Latin. 



Here M. Kirch hints, that the observations of this comet, published in Nov. 

 Liter. Lipsien. are not accurate; for, on the 23d of January in the mornings 

 the comet formed an isosceles triangle with and (p of Cassiopeia, and not with 

 8 and (p; and in the evening, the (p of Perseus, the comet, and the 9 of Cassio- 

 peia were as to sense in a straight line. 



M. Kirch observed the comet from the 18th of January to the 5th of 

 February: the following table exhibits its places by observations, at 10 in the 

 evening, when it could be seen. 



18 Jan. . 

 21 Jan. . 

 23 Jan. . 



26 Jan. . 



27 Jan. . 



28 Jan. . 



