K. _One of the Faces of _Mars_, as S. _Cassini_ observed it _March 3. (_st.n._) 1666_ in the Evening, with a Glass of 24 Palmes._ L. _The other Face, as he saw it _Febr. 14/24_ in the Evening._ M. _The first Face, as S. _Campani_ saw at Rome, _March 3. 1666_. in the Evening, with a Glass of 50 Palmes._ N. _The second Face, as the same _Campani_ observed it _March 18/28_. in the Evening._ O. _The figure of _Mars_ as it was seen at _Rome_ by a Telescope of _Divini_ of 45 Palmes, _March 20/30_._ P. _The Figure of the said Planet, as it was seen the same day and hour at Bononia by _Cassini_; being that of the second Face._ * * * * * _Some Observations lately made at _London_ concerning the Planet _Jupiter_._ These, as they were made, so they were imparted, by Mr. _Hook_, as follows: [Illustration] A. 1666, _June_ 26. between 3. and 4. of the Clock in the morning, I observed the Body of _Jupiter_ through a 60 foot-glass, and found the apparent Diameter of it through the Tube, to be somewhat more than 2. degrees, that is, about four {246} times as big, as the Diameter of the _Moon_ appears to the _naked_ Eye. I saw the Limb pretty round, and very well defin'd without radiation. The parts of the _Phasis_ of it had various degrees of Light. About a and f, the _North_ and _South_ poles of it (in the _Fig Q._) 'twas somewhat darker, and by degrees it grew brighter towards b. and e, two Belts or Zones; the one of which (b) was a small dark _Belt_ crossing the Body Southward; Adjoyning to which was a smal Line of a somewhat lighter part; and below that again, Southwards, was the great black _Belt c_. Between that, and e, the other smaller black Belt, was a pretty large and bright _Zone_; but the middle d, was somewhat darker than the edges. I perceiv'd about 3^{h.} 15^{m.} near the middle of this, a very _dark round Spot_, like that represented at g, which was not to be perceiv'd about half an hour before: And I observed it, in about 10. minutes time to be gotten almost to d, keeping equal distance from the _Satelles h_, which moved also Westwardly, and was joyn'd to the Disk at i, at 3^{h.} 25^{m.} After which, the Air growing very hazy, and (as appeared by the _Baroscope_) very light also (in weight) I could not observe it: So that it was sufficiently evident, that this black Spot was nothing else, save the shadow of the _Satelles h_, Eclipsing a part of the Face of Jupiter. About two hours before, I had observed a large darker spot in the bigger _Belt_ about k, which in about an hour or little more (for I did not exactly observe the time, nor draw the _Figure_ of it) moving Westwards, disappear'd. About a week before, I discover'd also, together with a Spot in the _Belt c_, another Spot in the _Belt e_, which kept the same way and velocity with that of the _Belt c_. The other three _Satellites_ in the time of this Eclipse, made by the _Satelles_, were Westwards of the Body of