C 4°7 )

Again, An. l686. Jul. 16 . ich p. m. the Parallax os thc Orb is io 0 46'.Subductive. Hence

Fis. 144.

I

X

3

4

The Simple Paralia fticl^Intervals Sub ■ ■Half Duration of theEclipses add.-

d. h. '

0 i n

0 I IO

d. h. '

0 1 35

0 1 30

d. h. '

0 5 IO

0 1 11

d. h. '

O IX OO

The Parallaftick. Inter-vals augmented.—The next last Emersi-ons, and pailing theAxis of the Shadoxv ,Jul. -

0 X xx

15 5 55

0 4 5

IJ" u X

0 631

'5 9 19

0 IX OO

15 17 52.

The Time of last pafsing the visible/tfxH

of Jupiter -

The Time propofed -

r 5 3 33

1 6 10 00

O

O

O

15 1 48

16 10 00

15 5 52. '

16 10 00 .

The Intervals of Moti -on ■ 1 ■ ■

Therefore Distan. fromJupiter s Axis -

1 6 xj

Id.

yj. Dext.

0 16 z

fd.

8-'. Sin.

1 7 IX

fd.

134. Sin.

r 4. 8- ^fd. I

iOi.. Sin.

And the Satellites stand at the two proposed Times as in the two Fi-gures.

In drawing of which, tho’ I have constdered their Latitudcs from the Lineof their utmost Elongatiotis pasling through Jupiters Center, yet I give no -Rules for determining it, the Contrivances and Directions necessary on thatAccount, heilig too many and troublesome to be iiiserted here : My Design 'is only to stiew the Ingenious Observer, how to find at wbat Distance from;¥, each Satellite appears, that so he may not mistake one for another when.he is to Observe any of their Eclipses .

XC. i. An. 1668. The Frencb Astranomers havCTnade thde Gbservations Eclipfcs unAiby a 14 Foot Telescope. w«« of thr

‘ Satellites of;

Oft ob. 7. ich ^x' p. m. The First Satellite ( CdlJecL Pallas ) Entreduoon v ed[jt Parrr^;

thc.Face of Jupiter. 1 h 7 ..

. -1.44. f, 892£-

Qtiob. 8,.