ftiew the good agreement of my numbers with the 
heavens. 
Anno i6%o,OSlober zi, old Stile/ Signiov "Jofeph Pon^ 
thi'a, and Marco Jntonio £eUio with a Tdlefcope of 2f 
Palms Jong, Obferved the tocall Immerfion otthefirft 
Sate Hit into fhadow at Rome at i q^. 07'. 5-3". p. m, 
whichin our Obfervatory here Inoted at 9. ly. 4i> whofe 
difference is the difference of our Meridians = ^2-12", 
or I 3**. o'3. 
Again, January the 28 K^Sy, Signiov Francis B I anchi- 
ni, having received my Catalogue of the E^^Upfes oi 
the Satellits for that year, obferved the totall Imnier- 
lion of the i" ^itlR^me, at 11^. 19'! which 
I faw not here, but my numbers give at 10. 2 7|. 
Therefore the difference of Meridians is o 5'2f ; and 
l^me lies fo much more Eafterly then the Oblervato- 
ry at Greenwich, agreeing with the former obfervation, 
and fliewing the error of the Tables to be infenfible. 
The noble Tycho judged therefore not much amifs, 
when he placed Vraniburg and I^me under the fame 
Meridian', for by leverall obfervations oiSatellit Eclipfes^ 
it is evident, that the difference oi Meridians betwixt 
TJraniburg and our Obfervatory is 5-1'. 10". of time,fo 
thzt ^Qme lies onjy one minute of time or J of a de- 
gree to the Eafl of t;r<««/^2^r^. 
Some Ingenuous perfons having often wifhed thatfuch 
Tables oF the Satellits motions were publiflied, as might 
ferve to find their appearences at any given time* tho 
I think it not fit (by reafon they are capable of mwch 
Correction and great improvement) to publifli mine at 
prefent; yet for the fake of the diligent oblerver, I 
have contrived a fmall Inftrument, whereby with the 
fole help of the following Catalogue, and the Table 
of the Parallaxes of orb , their diftances from the 
Axis of "'^ may be found to any given time within 
the compafs of the next year, and for any future year 
by the like Tabks> To 
