public void TestAzimuth()
{
// Sanity checks.
Assert.That(MathHelpers.Azimuth(0, 0, 1, 0), Is.EqualTo(0.0));
Assert.That(MathHelpers.Azimuth(0, 0, 0, 1), Is.EqualTo(90.0));
Assert.That(MathHelpers.Azimuth(0, 0, -1, 0), Is.EqualTo(180.0));
Assert.That(MathHelpers.Azimuth(0, 0, 0, -1), Is.EqualTo(-90.0));
Assert.That(MathHelpers.Azimuth(0, 0, -1, -0.0000001), Is.EqualTo(-180.0).Within(0.0001));
// The known azimuth from LAX to JFK.
double result = MathHelpers.Azimuth(LaxLatitude, LaxLongitude, JfkLatitude, JfkLongitude);
Assert.That(result, Is.EqualTo(65.8687).Within(0.0001));
// The return flight.
result = MathHelpers.Azimuth(JfkLatitude, JfkLongitude, LaxLatitude, LaxLongitude);
Assert.That(result, Is.EqualTo(-86.1617).Within(0.0001));
}
