10 Nov '08 02:07>1 edit
Originally posted by AThousandYoungA degree is pi/180 radians.
A = 4GM/c^2R
G = 6.67428 x 10^-11 m^3/kg*s^2
M = 1.9891 ×10^30 kg
c = 299,792,458 m/s
R = 1.392×10^9/2 m = 6.96x10^8 m
4GM = 5.31032 x 10^20 m^3/s^2
c^2 = 8.9876 x 10^16 m^2/s^2
4GM/c^2 = 5.9085 x 10^3 m
4GM/c^2R = 8.489 x 10^-6 radians
I was careless with rounding; I rounded as I felt like it, not according to any kind of strict ...[text shortened]... significant digits. The small difference between your answer and mine should be insignificant.
An arcminute is 1/60 degree.
An arcsecond is 1/60 of an arcminute.
According to wikipedia, this means that an arcsecond is 4.848 x10^-6 radians.
http://en.wikipedia.org/wiki/Minute_of_arc