[ 196 ] 

An ExtraSl of a Letter from Mr. J. Flamfteecl Aftr. 
Reg. and Reg. Soc. S. giving his calculation of the 
Eclipfes of Jupiters Satellites for the Tear 1687. 
Together with a Table of the Parallaxes of the 
Orb , and the Ephemeris of fupiters Geocentric 
Place for the fame Tear ; to which is added an 
Obfervation of the Eclipfe of the,Moon , Novemb. 
30, 1695. made at Lifbon, and Mr. FlamfteedV 
own Obfervation of the Eclipfe of Jupiter by the 
Moon on March 3 ith . pajl . 

I Give you here a Catalogue of all the Eclipfes of % s Sa¬ 
tellites, for the enfuing year 1687. and together with it 
2 Tables, one of his Geocentrick places, the other of the Pa¬ 
rallaxes of his Grbit to every day in the faid Year. This is 
the 4 tb. Catalogue I have got published in the Tranfa&ions. 
With the 1 ft. printed Dec. 1683. Num. \ 54. I (hewed their 
ufes, and how by their help the difference of Longitude, 
betwixt any two places on the Earth, where they fhould be 
obferved, might be determined. And I Taught a Method 
of finding out within what fpace on our Globe any of them 
would be obfervable: This was done in English for the ufe 
of our Country-men. Next Year in December 1684. I re¬ 
peated thofe Directions in Latin Num. 165. pag. 760. for the 
benefit of Forreigners. In the two Tranfaftions of Decern. 
85. Num. 177 and 178, with the Catalogue of Eclipfes I 
defcribed a fmall Inftrument, and (hewed by the help of it, 
the faid Catalogue, and the Tables of V Geocentrick places 
and Parallexes, the appearances of the Satellites at any time 
within the compafs of that Year might be difcovered and de¬ 
lineated ; if therefore the Reader defire to be informed con¬ 
cerning the ufe of the Catalogue and Tables herewith print- 


The Royal Society is collaborating with JSTOR to digitize, preserve, and extend access to 

Philosophical Transactions (1683-1775). 

www.jstor.org 







[ *97 ] 

ed, he may repair to the above-mentioned Tranfadlions. 

I fhall only add. 

That whereas for the two Years laft paft, the 4 th. Satel- 
lit has not heen Edipfed. As this Year enters, it begins to 
fall into v s fhadow, and that its Eclipfe will again be ob- 
fervable for the 4 next Years. The firft that happens Feb. 
2. in the Morning will be well worth the attention of the 
Curious; in that its duration is the fhorteft of any that fol¬ 
low it this Year; both the IngrdTe and Emerfion are Vifible 
with us, as are all thofe in the Catalogue which are alike 
marked with an Afterick (*) which if they fhall be exact¬ 
ly obferued, may ferue to determine the place of the Node 
of the orbit of V s Satellits, and its Inclination to the orbit 
of if, by comparing the obferuation either with fuch as 
wee haue already obtained, or as may be made hereafter. 

In my laft obferuations, the Eclipfes of the 2 d and 3 d Satel- 
lit have anticipated my Calculations fomething more than 
I expected in fo fhort a time ; of which I thought it conue- 
nient to acquaint the Reader, that hee may attend them one 
quarter of an hour earlyer than the times noted in the 
Catalogue. In 2 or 3 Years more we may expert opportu- 
nitys of obferuations, which will afford us fuch a correction 
for the error, that the Numbers fhall fail no more in them, 
than in the 1 ft. whofe Eclipfes have not yet differed aboue 
3 minutes from the Calculation. 

I giue you further herewith an obferuation of the Lunar 
Eclipfe Nouember 30, 1685. made at Lijbon by my kind 
Friend Mr. Henry lacobs: and another of my own of the 
Occultation of V- by the Moon, March the 31 th. this Year 
1686: of which you haue publifhed feueral forreign ob¬ 
feruations already. 


Tab- 



[ j 9 8 ; 


Tabula rarailaxium Jovts 


JanitaA Febru. Martii. \ April. Mail. 



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[ 206 ] 

Defe&us Lunaris Ulijfippottce a Do. Jacobeo Obfer- 
vatus Nov. 30. 1686. 



11 . M. 

Initium 

8 02 

Immerfio 

9 06 

Emerjio 

10 50 

Finis 

11 57 


Jovis a Luna te&i Obfervationes Grenovici habitce a Jo. Flam- 
fteedio Math . Reg. Martii 31. 1686, 


Mart it 31 
5 


Temp, corr 
\perhor.oJcil 

H. M. S. 

9 - 3 2 * 3°| 


U s limbus tangebat limbum Luna luci- 
dum , Mareotidis diametrum a termino 
ejus boreo. 

33. 42I ^ Totus teaus erat. Quantum per va- 

\pores horizontis & undulationem limbi 
valde turbiaam, licuit conjicere. 

[10. n. I2{ Differentia declinationem limbi Luna 
vere Aufirini PS loci Ingreffus, Tubo ped. $ 
& Micrcmetro 1546 = 1 2 m. 42 fee. 

30. 30 J’ovis particula emerferat, e regions 
realis limbi Maotidis. 

31. 36 Jupiter totus liber. 

3 5. 50 Differentia declinationum centriJovis, 

PS limbi Luna Aufirini 3 43 6=2 %m. 5 fi 
41.40 Repet. 3 58 5=29/7;:.2 8y. 

44.00 Luna Diameter 3 906=3 2777.07^ 
45.44* Repet, 3915=32^,1196 


Ac - 



