( 6 ;;)

Jtfetnphhf may Vindicate him,) the former were too great a Stupidity, andthe latter too great a Presumption. But to return to Rhodes : an Ifland (iniEustathius’s Comment upon Dionysius s artfifya;) os 910 furlongs circuit,*where according to Ptolemy the Parallel pailing dia. hath 36° of'Latitude, and so hath Lindus, and ’Ihavojs« the chief Cities of the Ifland ;the sime is confirmed by the M 3 . but where the Printed Copy and Eu-stathius read ’l»xvw&, which Mercator renders T dlyjsus, the MS. rendersIx/tnss. Abulfeda in tome Copies fituates the Ifland RJsodcs, ( for he men-tions no Cities there ) in the Latitude of 37 Deg. and 40 min. and the Gea-grapby of Said Ibn Aly Algiorgany, commended by Gilbertus Gauhnyn, in 37 0 ,if it be not by a Tranposition in the MS. of the Numerical Letters in Ara-bicis 37 for 36, which by reafon of their Similitude, are osten confoundcdin Arabicis MSS. By my Observations under the Walls of the City Rjrodes,with a fair brass Aßrolabe of Gemma Fnsms , containing 14 inches in the Dia»meter, I found the Latitude to be 37 0 and <50'. A 1 arger Instrument I durstnot adventure to carry on Shore in a Place of so much Jealousie. And thisLatitude in the Chart I have alllgned to the City Rhodes , ( from the Iflandso denominated, upon which on the North East lide it stands situated; betteragreeing with the Arabians than with Ptolemy , whom I know not how toexcute.

XXVI. In the fecond Book of the Voyagc dc Siam des Pcrcs Jefuites , are Lang. 0]related two observations of the Satellites of Jupiter, capable, if well rnade,to afeertain the Longi rüde of the Cape of good Ilcpe. The First was there p. 253,rnade June ad st. n. 1685, when at u h 19' ro". the Eiist or InncrmostSatellite touched the Western Edge of Jupiter, and at 11 ^ 3 c* so 1 * it ap-peared no more: this Obfervation is said to be rnade with an excellent Te-leseope of iz Foot. The other was on June the 4^ following st. n. whenthe Emersion of the fame Satellite was observed at 9h 37^ 4 rj, f r0 m whichLatter is concluded, that the Lcngitude of the Cape is 18 0 to the East ofParis, tor that the laid Emersion, according to the Calculus of Cajstni, in theMeridian of Paris, ought to have happen’d at 8h % 6 '. This tarne Emersionis computed by Mr. Flamsteed at 8n 19'. at London, that is 3 min. laterthen by S. Cajstni ; and considering that neither is Verihed by obfervation inEurope, the Longitude hence deduced is doubtful at least 3 min. if this hadbeen the only obfervation. But the former being considered will yet fhewthat there is a much greater Doubt still remaining : For from certain A-stronomical Principies the Parallax of the Orb, or difference between thePlace of Jupiter feen from the Sun and Earth was, at the time of the sirstObfervation, 9 0 9'• Which Arch that Satellite moves in i h 6 r . and theutmost Duraticn of an Eclipfi thereof in this position of Jupiter being fearcea. h id. (as appears by the accurate Observations of M. C affini and Mr. Flam -siced ) it will follow, that from the Immersion hehind Jupiters Western Edgeto the Emersion out of the Shadow, there could not be füll 3h Where-fore the Emersion out of the Shadow, on June 2.^, ought according to thetitne of Immersion, to be at 14h <j 6 '. at the tatest at the Cape } which by

Mr,

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