( m ) 
I. Obferyations on the Eclipfe of the Moon^ June 1 8 , 1721* 
and the Longitude o/Port Royal m Jamaica determined 
thereby, !By Dr, Halley, Ajlronomer ^yal^ F.( 2 ^ 5 . 
T H E Eclipfe of the Moon which happened in June 
lafl, 17x2, was fb far hid by the cloudy Sky, that 
neither myfelf, nor any ofourAflronomical Friends, 
in or about London, could furnilh an Obfervation thereof 
worthy to be laid before the Society. But the fame having 
been well obferved at Jamaica, by the late curious Capt. 
Candler, Commander of his Majeflies Ship Launcefton, 
(whofe Example it were to be wifhed, others in the like Poft 
would imitate) and at Berlin, by Mr. Chriji fried Kirck, 
Aftronomer of the Royal Academy of Sciences there. I 
thought it notamifs to prefix to their Accounts that little I 
was able to note concerning it. 
Sunday, June \%, mane. Having perfecSbly redlified my 
Clock fb as to iliew the Apparent Time, neither the tranfit 
of the Moon over the Meridian, nor the beginning of the 
Eclipfe which foon followed, could be feen thro’ the very 
thick Cloud. At 13 ix/ !T. aff, a fmall Particle of the 
Moons Body was feen through a very little hiatus in the 
Cloud, by which glimpfe I could only be affured that the 
Eclipfe was not yet Total. At 13 h. 29' by fuch another 
view. I was fatisfied that it was now become Total ; but 
in a Moment, it again difappeared, till 14 h. 49^ ro^/, when 
the Cloud beginning to break, I got time to meafure with 
the Micrometer, the Tartes Lucida now recovered in the 
Moon’s Diameter, which I found 14'. 00", though this not 
fo well as I could wifli,by reafbn of a thinner Sort of Cloud 
which perpetually intercurr’d, and render’d the Edge of the 
Shadow fomewhat dubious. 
At 1 5^ 1 5 ' the Moon was pretty well got out of the thick 
Cloud, but being very low, and the Daylight become flrong, 
Ihe fhone very fointly, and the Shadow became worfe and 
worfe defined. 
From 
