\[
e” = \frac{AREA}{R^2 \sin 01″}
\]
Where:
$e”$ = spherical excess
$AREA$ = area of triangle
$R$ = average radius of curvature
\[ C_2 = \frac{E_1}{3} \] Where:
$C_2$ = 2nd correction
$E_1$ = Error in 1st correction
$e”$ = spherical excess
$AREA$ = area of triangle
$R$ = average radius of curvature
If the triangle does not close to 180°, proceed to 2nd correction2nd correction:
\[ C_2 = \frac{E_1}{3} \] Where:
$C_2$ = 2nd correction
$E_1$ = Error in 1st correction
Add the 2nd correction algebraically
