Some of these Praedictions have been verified not only at _Rome_, and in other places of _Italy_, but also at _Paris_ by M. _Auzout_, the most Celebrated and the most Exact of our _Astronomers_; and in _Holland_, by M. _Hugens_. And we can now doubt no longer, of the rotation of the _Satellits_ about _Jupiter_, as the Moon turns about the Earth; nor believe, that _Jupiter_ or his _Attendants_ have any other Light, than that, which they receive from the Sun; as some did {172} assure before these Observations. There remained to find by Experience, whether _Jupiter_ did turn about his _Axis_, as many believe, that the _Earth_ turns about her's. And although most _Astronomers_ had conjectur'd, it did so, either by this Analogy, or by other Congruities, yet it was much wish'd, that we might be assured thereof by Observations. And this it is, for which we are obliged to M. _Cassini_, who, having by the advantage of the same Glasses discover'd several changes, as well in the three obscure _Belts_, commonly seen in _Jupiter_, as in the rest of his _Diske_, and having also observed Spots in the midst of that _Planet_, and sometimes _Brightnesses_, such as have bin formerly seen in the _Sun_, hath at length discover'd a _Permanent Spot_ in the _Northern_ part of the most _Southern_ Belt; by the means whereof, he hath concluded, that _Jupiter_ turns about his _Axis_ in 9. hours, 56. minutes, and makes 29. whole circumvolutions in 12 dayes 4. minutes of ours, and 360 in 149. dayes. For he has found, that this _Spot_ was not caused by the Shadow of any _Satellit_, as well by reason of its Situation, as because it appeared, when there could be no Shadow. Besides, that its motion differed from that of the Shadows, which is almost equal, as well towards the Edges as towards the Middle of _Jupiter_: Whereas, on the contrary, this _Spot_ hath all the accidents, that must happen to a thing, which is upon the surface of a round Body moving; for example, to move much more slowly towards the Edges, than towards the Middle, and to pass over that part, which is in the middle of the Diske, equal to the half of the _Diameter_, in the sixth part of the time, it takes to make the whole revolution: he having seen this half pass'd over, in 99 or 100 minutes just, as it must happen, supposing the whole circumrotation is made in 9. hours 56. minutes. He hath not yet been able to determine the Situation of the _Axis_, upon which this motion is made, because the _Belts_, according to which it is made, have for some years appeared streight, though in the precedent years, other _Astronomers_ have seen them a little crooked: Which sheweth, that the _Axis_ of the diurnal motion of _Jupiter_ is a little inclined to the plain of the _Ecliptick_. But in time we may discover, what certainty there is in this matter. [Sidenote: _These _Tables_ are not yet sent over, but, 'tis hoped, will be, ere long._]