therto
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.

He wishes, that all the changes that shall fall out in this _Comet_, might
be exactly observ'd; because of its not being swift, and the Motion of the
Earth very sensible