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his Notes observed. Sol aquinoStiali tempore ariete 
librnque verfandoy quas ex gnomone partes habet 
novem, eas umbra fac it o£lo> in declinatione coeli , 
qua eft Roma. 
We come laft to the Latitude of Ancona , which is 
given by Manfredi 43 ° sA> or 16' lefs than that 
above collected from Rliny 5 but which is fet down 
by Rtolemy 43 0 40', half a Degree lefs than the 
fame. This may however be looked upon as no 
bad Obfervation, confidering the Time when, and 
the Manner how, it is fuppofed to have been made, 
as we are ignorant of the Hour when the Sun really 
croffed the Equator on the Days of Obfervation 5 
and efpecially as it comes, with all its Imperfe&ions, 
as near to the Truth, as that reported both by our 
Author and Vitruvius to have been made at Rome 
itfelf j and as it only exceeds the true Latitude by 
about the fame Quantity, which that given by Rio- 
lemy feventy or eighty Years afterwards fell fhort of 
the fame. 
It therefore appears, upon the whole, that this 
Text needed no Corre&ion 5 and for the Obfervation, 
that 3 y Parts were too many for a Gnomon to be di- 
vided into, it will be found ro have very little 
Weight, when it is confidered, that the Antients 
made ufc of very large Gnomons upon thefc Occa- 
fions; that one of the Obelisks now (landing at 
Rome , that of St. Johns Lateran , is in Height 108 
Eng/ifh Feet without the Pedeftal 5 and that the 
other, (till buried under the Campo Marzo , which 
was formerly ul'cd for this very Purpofe, wanted but 
little of the fame Height. The thirty-fifth Part there- 
fore of the Height of fuch a Stone, did not fall 
