Given two stars with angles of declination and right ascension (d1, a1) and (d2, a2), the angle they subtend is given by the formula

where a1 and a2 are angles between -180 and 180 degrees, d1 and d2 are angles between -90 and 90 degrees, a = a2 - a1, and d = d2 - d1. Write a program to take the declination and right ascension of two stars as command-line arguments and print the angle they subtend. Hint : Be careful about converting from degrees to radians.

Transcribed Image Text:

2 arcsin ((sin (d/2) + cos (d) cos(d)sin(a/2))/)