Spherical Law of Sines

Move the three points on the sphere. The app draws the spherical triangle and computes its side lengths and angles. For a spherical triangle, sin(a)/sin(A) = sin(b)/sin(B) = sin(c)/sin(C).

Point A

Latitude: 35°

Longitude: 20°

Point B

Latitude: 10°

Longitude: -85°

Point C

Latitude: -30°

Longitude: 70°

Item	Degrees	Radians	Sine	Ratio
a opposite A
b opposite B
c opposite C
A				—
B				—
C				—

All side lengths are central angles on the unit sphere.