in proportion to the Circle A D ; and then indeed tak- 
ing the Point F in the Earths furface, and by Unes front 
thence dividing the Angle AF D into what ever equal 
parts, the Intercepted Arches J B, B C, CD fhall be une- 
qual. But if he had confidered, that the Earth is as it 
were a point inRefpe£t of the Sphere of the fix'd Stars, 
nay the very Annual Orbit of the Earth is almoft if not 
altogether imperceptible ( faving the truth of Mr. Hooks 
Attempt^ he would have found that the Lines FB, F C, 
FD, muft be all conceived as drawn from the point G, 
and then equal Angles will intercept equal Arches, and 
equal Arches equal Angles: andfbit happens ( at leaft be- 
yond the Poflibility of difcovery of fence ) to the Eye oa 
the liirfaceof the Earth. And befides he fhould have 
confidered, that all Obfervations Aftronomical are per- 
formed as from the Center of the Earth, and therefore 
it is that they keep fucha ftir about Parallax. ; fb that his 
drawing his lines fofar fromG as F island to another con- 
centrick Circle fb nigh as A D,deceiyed him in this Point. 
The Famous Gajfendus has written 4 large Epiftles on 
this Subjed, the fubftance of all which is, that the Moon 
being nigh the Horizjon and looked at through a more Fog- 
gy Air, cafts a weaker Light;, and confequedtly forces 
not the Eye fp much as when brighter; and therefore the 
Pupil does moreinlarge it felf,thereby tranfmiting a larger 
ProjeQ:ion on the KetimXn this Opinion I doe find he is not 
alone, for in the Journalls des Scava^s^ this difquifition be- 
ing again revived by a French Al?l^e^ He therein follows 
this Sentiment of Gaffefidm ; it was firft Publifhed in the 
Conferance prefented to the Dmphm m AM^gufi 1672, 
but by Reafbn of an Objeaion moved by Father Pardye^, 
k was fain to be republifhed with fbme additions and a- 
mendments in 0^(3^. 1672. The addition was, that this 
Con trading and enlarging of the Pupill caufeth a differ- 
ent ihape in the Eye; an open Pupil making ihQCryJtdine 
flatter and tlie Eye longer, and the narrower Pupil lliort- 
