a Pq/Jage in ebn younes. 233 
What I have now advanced da all be exemplified under 
the firft eclipfe, which is one of the Sun. 
In this eclipfe, according to the manufcript, at the be- 
ginning, the Sun’s altitude was more than 1 5 (*>) degrees, 
and lefs than 16 (*>); au d at the end it was more than 
33 degrees (gJ) and j. But I make the Sun’s height 
at the beginning 30 (J) degrees, and at the end nearly 
36 (V ). In the manufcript, the digits eclipfed are faid to 
have been 8 (v, or a> as it is fometimes written) ; but I 
make them only a little more than 4(0), or about 4|. 
Whether the notation in the original manufcript of 
ebn younes was in letters or arithmetical figures is un- 
certain ; but moft probably it was in the former of thefe 
two, as it is in moft of the tables now extant, though 
compofed fince the admiffion and ufe of arithmetical 
figures. Upon this fuppofition then, or that they were 
fo in the manufcript from whence the prefent manufcript 
was copied, we fhall very naturally account for the mif- 
takes we find in it. 
Thus for inftance, J by fome accidental ftroke at the 
bottom, would eafily be taken for <J, as is fometimes 
written in manufcripts ; and if the perpendicular ftroke in 
the J was made fhort, as in a table it very well might be, 
' (.3^) would naturally be taken for rd or (15); and, 
Vol. LX VII. H h by 
