230 
MicroGRAPHIa. 
Limb, thefe Rays, being by the tmojphere inflected, appear to the eye 
at E, as if they had come from the points, Nand O3 and becaufe the 
Ray L has a greater inclination upon the inequality of the Atwofpbere 
then I, therefore mutt it fuffera greater inflection, and confequently be 
further elevated above its true place, then the Ray I, which has ale& 
inclination, will be elevated above its true place; whence it will 
follow, that the lower fide appearing neerer the upper then really it is, 
and the two /ateral fides, viz. the right and left fide, fuffering no fenfible 
alteration from the inflection, at leaft what it does fuffer, does rather 
increafe the vifible Diameter then diminith it, as I fhall thew by and by, 
ae Figure of the luminous body muft neceflarily appear fotnewhat 
iptical, Piss | 
This will be more plain, if in the feventh Figure of th 37. Scheme we 
fuppofe AB toreprefent the fenfible Horizon ; C D EF, the body of the 
Sun really belowit; GHIK, the fame appearing above it, elevated 
by the inflection of the Atmofphere : For if, accent to the beft obfer- 
vation, we make the vifible Diameter of the Sunto be about three or 
four and thirty minutes,and the Horizontal refraction according to Ticho 
be thereabout,or fomewhat more,the lower limb of the Sun E,will be ele- 
vated to 13 but becaufe,by his account, the point C will be elevated but 
29. minutes, as having not fo great an inclination upon the inequality of 
the Air, therefore IG, which will be the apparent refraéted perpendicu- 
lar Diameter of the Sun, will be lef then‘C G,which is but29. minutes,and 
conlequently fix or feven minutes fhorter then the unrefracted apparent 
Diameter. The parts, D and F, will be likewife elevated to H and K, 
whofe refraction, by reafon of its inclination, will be bigger then that of 
"the point C,though lefs then that of E;therefore will the femidiameter IL, 
but 
be fhorter then LG, and confequently the ,under fide of the appearing 
Sun more flat then the upper. . | FIG) CUoTSH} Hin etn 
Now, becaufe the Rays from the right and left fides of the Sun} ¢<c. 
have been obferv'd by Récciolo and Grimaldus, to appear more diftant 
one from another then really they are,though(by very manyObfervations 
that I have made for that purpole,with a very good Tele(cope,fitted witha 
divided Ruler) I could never perceive any great alteration, yet there be- 
ing really fome,it will not be amifs,to fhew that this alfo proceeds from the 
refraction or inflection of the Atmofphere; and this will be manifeft,if we 
confider the Atmofphere as a tran{parent Globe, or at leaft a tranfparent 
fhell, encompafling an opacous Globe;which, being more denfé then'the 
medium - oxide it, refracts or inflects all the entring parallel Rays 
into a point or focus,fo that wherefoever the Obfervatoris plac’d within 
the Atmofphere, between the focus and the luminous body; the/ateral 
Rays mutt neceflarily be more converg’d towards his eye by the refradti- 
on or inflection, then they would have been without it; and therefore 
the Horizontal Diameter of the luminous body muft neceflarily beaug- 
mented. } at 210g que 
This might be more plainly manifeft to the eye by the fixth Figure’ 
| boca it would baliarerat tedious, and the thing being ema 
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