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By tVii» TalL to sind thc Time os any Mean ConjunElion, Past or Future,nearest to any Place os the Zpdiack _; sor Times Past, /ubstract the Longi-tude of the given Place from the Longitude of the Radix 4 S no 4^,. t h eresidue seek in the last Column of the lable ; is you find not the precilcNumbcr take the next to it, against this you have in the second Column theYears and Days, and in the sirst the Number of ConjunHions past since anywas made in that Place, (ubstract the Years and Days from 1683. Jan. 14.,and the'Motion Trom 4, u 0 1 S'- & hsve you the trucTima of the MeanConjuuiHon, and Longitudes of the Planet s then.

But for Times to come, (iibstract the Radix from the given Place, seek theResidue as before in the last Column ; if you find it not, ta'ke that you sindnearest it; against which, as before, you have in the second Column, theYears and Days; in the sirst, the Revolutions future; for Example.

If it wert required to know when the last Conjunllion happcn’d in the sirstDeg.of ss, Substracting ™ or Ten Signs from 4, iio 15'. the Residue is6 S Ho 1 y'. which leeking I cannot sind in the third Column of the 1 ’ablc,but I sind 6 S iio 56'. which is not two Degrees more, and against themyi6 Years, 57 Days, and in the sirst Column 26. for the Number of C-junftions interlapsed. Substracting y 16 Years, 57 Days from 168;. Jan. 14.there remains 1 166 Years, 322, Days, which fhews me that the CovjunHionwas in the Tea, 1166. Kov. 18. and substracting the Motion 6 t ix° 56',from 4s ii° 4> / - it points me to the Place in 9* 28° 49'.

Or if the Time of the sirst Conjunelion in — to come were demanded. Isubstract thc spadix 4® 110 4^. from 6 Signi, the Residue i S 170 I(eek in the Table but sind it not, I take therefore the next to it, i* 29'.the next to it, against which stands 357 Years, 124 Days, these added to1-683. 14. give me the Year 2040, and 138 Days, May 18. for th e

Time of this ConjunFlion, and adding the i s 2O0 29'. to the Rjidix 4* iio45 ,/ . it makes 6* 2 0 14^. for the true mean Longitude of this Conjunflion.

From the Mean Conjunelion the Apparent may be found by the help of aPlanetary Instrument, or the usual Astronomica] Tables.

The shaiom of LXXXVI 1 I. i. S. Campani asfirms, that he hath remarked in the Bclts ofTupncr’s SatcU Jupiter, the Sl a dens of his Satellites, and followed them, and at length seenlites obferved ; t [ iem Emerge Otlt of his Disk-

by r.Campam. ^ c affini, aster he had diseovcr'd ( by the means of those excellent^ Glaffes of 35 Foot made by S. Campani) the Si adores cast by the Satellites of

By M. Cassini j u pi tcr upon his Disl^ when they happen to be between the Sun and Him ;

io. 8 ’ rmd aster He had allö distinguistit their Bodies upon the Disk. of Jupiter ;f. 171. 11.82. madelbme Predictions when tliey (hould appear, to the End that the Curi-f.403?. ous m ;ghc be convinc’d of this Matter by their own Observations.

Somc of these Predictions have been verified, not only at Rome, and inother Places of Italy , but also at Paris by M.Augout, and in Holland by M, Hu -gens, particularly Sept, 2 6 . 1665. at half an Hour aster seven a Clock, oneos these Sbadoevs was seen both in France and in Holland.

These