Sfm to rpmcalculator

When the radius of a circle is large and the angle subtended by an arc is small, the arc will be nearly straight. So, the arc length is nearly the chord length. Arc length = (radius) X (angular spacing in radian). A better approximation is from 2 X distance X sin (angular spacing / 2). sin x is nearly x, when x is very small. This formula also gives the same 5-sd value.1.3927 E+05 km. Increasing precision in angular spacing, we get more sd in the answer.

The angular diameter of the Sun is nearly 0.5334 deg. The diameter of the solar disc is nearly (Earth-Sun distance) X (angular diameter in radian) = 149598262 X (0.5334 #pi# /180) = 1392700 km..