( 44-3 )

Declination the \ith, and iztb of March ; and that at that time, he passedthrough the Inferior Meridian at about two a Clock after Midnight.

If we have rightly determined his Perigee , and that the Hypothcsis of theEquality of his Motion be Just for that time, he hath been visible since theMiddle of February, at which time he was as far Distant frorn his Perigee byApproaching to the Eartb, as he is at present by Receding from ir. Hemust then have been at theextremity of the Southern ff'ing of the Snan, andarrived at the Southern Foot of Pegasus on the 2.; of Febr. of the fame bignesithat he was seen to be of Mar. 28. He must have arrived at the Stars ofthe Northern Arm of Andromeda Mar. 9. at thole of her Girdle I 2. when he wasin his Perigee , and in his greatest Declination; to her Southern Leg, Mar. 1 s ,between her Southern Leg and the T Hangle Mar. 18. very neai; as he was ob-servcd at La Flejcbe ; and under the Head of Medusa, Mar. 2s. The Days en-suing he must have arrived at the Places marked in our First Obscrvations :

But in the last he hath been swifter than this Hypothcsis will bear. To representthese latter Observations, the Line of the Motion ought to have been madeCurve, as we did for the end of the Apparent Motion of ihe Comet 166p.wich this difference, that instead of that Lines being Convex in regard ofthe Earth) becausethe Motion was Retrograde, this was to be Concave tc-wards the Eartb, becaufe that the Motion of this Comet is Direil.

It’s a thing *"orth Observing, that this Comet keeps bis Course almost Jikethatof the 2. Comet of l66s, and another of 15:77, observed by Tycho. Forthey have passed through almost the seine ConfleUations ; though this be moreinclined Northward, and cut the Ecliptick. s or 6 Degrees more forward thanthat of 1665. So that it scems that in this Place of the Heavens there is,as ’twere, a Z^diaquc for Comets.

CV. 1. Cometam novum D. Römer primum advertit 28. Apr. st. n. 1677.

& me statim de rei novitate admonito 4 h 6 f z 1". p. m. n. ejus Altitudi- by M. Caffini.’nem accepimus 12 0 22 f io 11 . Judicavi eum fuisse in Verticali declinante ab 1 35 - P* 848.Ortu ad Septentrionem 33 0 circiter. Die 29 mane, momento per nubes aD. Picardo vises est, 9' zl'si p. m. n. in Altitudine 4 0 39'.

Die 2 Maii mane, Ascensione Recta Medii Coeli ex Fixis existente 267°,

Altitudo Cometae erat 4 0 s'. Distantia Verticalis ä Septentrione adOrtum 42° 8 r . circiter. Die 4 mane 3 h 3o r . p. m. n. Altitudo Cometa fuit5* 33 r . Distantia A^imuthaltt ä Sept. ad Ortum 42° 32'. circiter.

Die 5. 32'. Altitudo Comet* fuit 5° io f . Distantia Atsimnthalis ä Sep-

tenr. ad Ortum 44° lo f . circiter.

Observationes quas habitae sent, Initio Cometam reponunt in Triangulo ,postremo prope Caput Medusa, ostenduntque Cometam procedere secundumSignorum Seriem per Lineam proximam, §c fere Parallelam Illi quam de-scripsit Cometa Au. 1^90. Mense Feb. Magnitudo Capitis, visi Telescopio,videbatur fere xqualis Jovis Diseo, aut paulo minhs; nec perfecte Rotundumapparebat, sed Figurae Ovalis, longiore Diametro Horizonti parallelo ; quodRefractioni Horizontali videtur tribuendum.

Coma ejus, Tele/copio vise; Latior, & ferme -Parabolica ; bjudo autem O-culo Angusta, & parum Inflexa ad Occasum, videbatur.

L 1 1 2 2. Prodiit