[ 3H ] 
what it will, the whole Hariz4)n can be but aCiixle : So 
that there is no room for the breadth of a thing (as to the 
Angle at the Eye ) to be made greater, what ever its Tall* 
nefi may ( the Refraftion not equally aflPe£ling all parts 
in the Circles of Altitude. ) Nor is there any reafon why 
this fhould rather thruft the other, than that the other 
thruft this, out of place. 
Whereas, in the -^/^/W^, it is otherwife; For while 
what is near; the Horizon is inlarged,that which is further 
oflp is thereby contraded : which as to the Azimuth or Ho- 
rizontd Pofition cannot be. 
In Speftacles indeed it is otherwife ; for they reprefent 
the Objeft every way inlarged ; and do thereby hide the 
adjacent parts. But in Refra£tion by Vapours, fuppofing 
all parts of the Horizon equally affefted by them, one part 
cannot be expanded in breadth ( whatever it may be as 
tothe highth) without thrxifting out an other ( for the 
Horizon can be but a Circle ) and^ .why one part 
rather than another ?■ : . - ^ : -Ji . t :l o.. , 
Unlefs we would fay as perhaps we may,, if thera 
fhall appear a neceffity for it) .ThatrtiieRays of.a lucid 
Body do expand themfelves every^ ^w^ay m the prejudice 
of the parfs adjacent, by covering themi. 
But fuppofing ( which I am apt to believ^^e, till the con- 
trary fhall be evinced by Experiment that the Sun or 
Moon's apparent Diameter taken by Injftrument near the 
Horizon^ is the lame as taken in a higher Pofitionj ( I mean, 
its Diameter, or that parallel to the Horizon \ 
for the erect Diameter, in a Circle Perpendicular to the Ho- 
rozon^ may by the Refraflion be varied, and thereby 
made, not greater, but left than when higher; as hath 
been noted in the Name of Sol lillipticm at the Horizon, ) 
fuppofing, I fay, that the Sun's apparent Diameter Ho- 
-rizontaly taken by Inftrument, is the fame near th^ Hori- 
zon^ as in a higher Pofition, I take its Imaginary great- 
nels which is fanfied near xh^Horizony to be only a decep- 
tion 
