( 395 )

From these Obfervations I State the Distances of the Planets from thcFixed Stars May 7 th at 9** ys p. m. as folJows,

o / //

Saturn from the Lyons Heart --—--10 58 yo

Jupiter front the farne ---10 5-9 oq

Saturn from E in the Lyons Head - — - - 8 39 40

Jupiter from the satne---8 yy 3 5

HencethetrueLongitude of Sät. si 14 2.7 42.. Lat. 1 12. 4 6. North.

of Jupiter K> 14 x 6 57. Lat. o 56 43. North.

Diflerencc of Longitude-——x 4. Lat. o 16 3.

The Diflerence of Latitudes something exceeds the Distance meafirred witlithe Micrometer, by reason that the Wind then Ihaking the Sextant permit-ted ns not to be so exact as usually, but the Disterence, being lese thun halfa Minute, I esteem inconsiderable.

The Diurnal Motion of Jupiter from Saturn was now 3' 1y 7 . it holdstherefore as 3 1 1 y'( ( one days Motion, ) is to one Day or 2.4 Hours ; so

x' 4 // . (the Distance of Jupiter from the 6 with Saturn j to 8 Hours, the

Internst betwixt the Oblervation and following ConjunBion, which was there-fore 17h afrer Noon, or according to the vulgär reckoning, May 8. at 5 aClock in thc Morning. At which time the true Place of the Plancts is 5114 0 2.8T, the Disterence of their Latitudes, 1 y' 40". Saturn being somuchmore Northerly than Jupiter.

In all, best efteemed, Aflronomical Tables extant, the Mean Motions of the-P lanct Saturn are too Swift, of Jupiter too Slow considerably: Hence U cametopasi that they madethe DireB ConjunBions some days Later, the Retrogradeearlier than they were found by Oblervation.

1, Oft. 2.6. st.n. i 1 * 40 / . mane Situm Jovis £c Saturni Tubo & Afierome- ott Dantzick ;tro ex voto deprehendere mihi obtigit : quo tempore simul Fixa quaedam (a- tyM.Hevchustis conspicua (quod notatu dignum ) dictis Planetis fatis prope adhaerebat. A '

Jupiter lese cum tribus Comitibus t um osterebat, forte & Quartus adfuit, sedf* 526.ob Nubeculas haud fuit conspectus. Saturnus distabat a Jove 1 6' 44P Jupi-ter a Stella (ni fallor in Armo Dextro 51 ) z~j' yy"; Rursus' Saturnus a di-cta Stella 38' i". Stella dicta versatur modo juxta nostrum .Catalogum !u1.90 2' 9''. sL & Latit. n 0 io' 4y". B. Die 30 OBob. yh inane DistantiaTj & V, 2.y/ 5 11 extititj Unde certo colligere licuit ConjunRionern jam antecomplures dies celebratam este quam Ephemerides Calculusque primum die 3Novem, exhibent.

Id quod sobsequentes Observationes adhuc clarius demonstrant. NamLoco, quod Distantia P Lc b de die in diem ( si <5 instaret) paulatim Mi-nor fieri debebar, continuo Aucta est. Die 1 Nov. hor. 2. mane, ope Micrc-metri nostri dicta Distantia extitit 31' 3 y". Et Die. x Ncv. eandem Distan-tiam rursus reperi 3^ 21". Die 3. Nov. mane hor. 1. jam 39' 9" ; Die4.

Nov. caelo perquam sereno adhuc paulo Maior dicta Distantia inter b & ¥deprehense.

E « e x

Alteram,