sum function

double sum(
  1. double m1,
  2. double m2
)

Combined apparent magnitude of two stars.

Implementation

double sum(double m1, double m2) {
  final x = 0.4 * (m2 - m1);
  return m2 - 2.5 * math.log(math.pow(10, x).toDouble() + 1) / math.ln10;
}