After wMcfi Ihave ooly m SebfeAe- my fcMm mmor- 
The Sentiments of the Kemrend and Learned Dr. 
John Wallis H. S. Soc. upon the aforefaid 
Appearance^ communicated in a Letter to the Pub- 
lijher. / 
/ ' _ ' ■ - - - - ■ ' ■ ■ ■ , ■ ■ 
AS tothelaft Inquiry f concerning which, you fay, 
the Royal Society would be glad to kno w my Opi- 
nion ; ) about the apparent Magnitude of the Sun near 
the Horizon^ greater than when confiderably high : 
The Inquiry is Ancient : And, I remember, I difcourfed 
it near fourty Years ago with Mr. Fofier^ then Profeffor 
of Aflronomy in Grefh am College. Who did then afTure 
Hie ( from his own Obfervation, I fiippofe ; for I have ne« 
ver examined it my felf, ) that the apparent Magnitude 
taken by Inftrument ( however the Fancy may appre- 
hend it /is not greater at th^Horizony than when high- 
er. And Mr. Cafrvell ( when your Letter was con*imuni- 
cated to our company here ) affirmed the fame. 
And ( though I have not my felf made the Obfervati- 
6n ) I do hot doubt but the thing is fb. For it is agreed ; 
That Refrafliion near the Honzo^y though ( as to appear- 
ance ) it alter the Altitude of the thing feen ) yet it alters 
not the Azimuth at all. 
And it mufl needs be fb. For, fince this equally ref^ 
pefts all points of the Horizon \ let the Refraftion be 
S f what 
