He affirms then, that the _Line_ described by this Star resembles hitherto a _Great Circle_, as it is found in all other Comets in the midst of their Course. He finds the said Circle inclined to the _Ecliptick_ about 26. d. 30'. and the _Nodes_, where it cuts it, towards the beginning of _Gemini_ and _Sagittary_; that it declines from the _Equator_ about 26. _d_ and cuts it towards the 11. d. and consequently, that its greatest _Latitude_ hath been towards _Pisces_, where it must have been _March_ 24. and its greatest _Declination_, towards the 25 d. of the _Equator_, where it was to have been _April_ 11. He puts it in its _Perigee_ _March_ 27. about three of the Clock in the Afternoon, when it was about the 15 degrees of _Pisces_, a little more _Westerly_ then _Marshab_, or the _Wing_ of _Pegasus_, and that it was to be in _Conjunction_ with the _Sun_, _April_ 9. Where yet he noteth, that according to another Calculation, the _Perigee_ was _March_ 27. more towards Night, so that the Comet advances a little more towards the _East_, and retards towards the _West_; which not being very sensible in the first days, differs more about the end, and in the beginning; which he leaves to Observation. He calculateth, that the greatest Motion it could make in one day, hath been 4. d. and 8'. or 9'; in one hour, about 10'. and 25". so that its _Diurnal Motion_ is to its last distance from the Earth a little more than as 1. to 14. and its _Hourly Motion_, as 1. to 330. He wonders, that it hath not been seen sooner; the first Observations that he hath seen, but made by others, being of _March_ 17. Whereas he finds, that it might have been seen since _January_, at least in the Months of _February_ and _March_, when it rose at 2 of the Clock and before: because it is very likely, that, considering its bigness and brightness, when it was towards its _Perigee_, it was visible, since that towards the end of _February_ it was not three times as much remote from the Earth, than when it was in its _Perigee_, and that towards the end of _January_ it was not five times as much. {39} In the interim, _saith he_, the other _Comet_ could be seen with the naked eye until _January_ 31. when it was more than ten times further remote, than in its _Perigee_, although it was not by far so bright, nor its streamer shining as this hath appeared.