[ 45 ° ] 
In the year before Chriff 880. the time of the win- 
ter folftice was December 29. at 1 5- minutes pah: fix 
o’clock in the morning, according to the vulgar reck- 
oning ; or, in the aftronomical account, 28^ i8 h iy ; 
and Co days after this, brings us to February 27. 
when the Sun's place was 1 i s oo° 6 ' 23'' ; his decli- 
nation louth 1 1° 27' 18" j his right afcenfion 3 3 2 0 
ji' y6' j from whence we fliall have his aicenfional 
difference K N = 9 0 8' iy . Then 
0 / // 
The femidiurnal arc, in a right fphere, is 90 00 00 
Afcenfional difference 9 08 iy 
Semidiurnal arc 80 yi 45 
This, converted into time, gives the time of Sun-fet- 
ting then at Athens y* 1 23' 27"; from whence we 
fhall have the nodturnal arc 13H 13' 6". 
. 0 • " 
Again j the Sun’s oblique afcenfion is 341 19 11 
Oblique afcenfion of Ardturus 147 52 40 
Difference 193 26 31 
h ' " 
This, converted into time, gives 12 y3 46 
Nodturnal arc 13 13 06 
Difference 00 19 20 
Semidiurnal arc, add y 23 27 
Time of Ardturus’s rifing y 42 47 
By this it appears, that at Athens, in the year be- 
fore Chriff 880, and 60 days after the winter tropic, 
the fiar Ardturus rofe at 19' 20" after Sun-fetting. 
^ But 
