public void Position_and_Direction_with_radius_and_declination()
{
var orbitingStand = new OrbitingStand(10, 0, Constants.HALF_PI * 0.5f);
var expectedPosition = new Vector3(10 / Functions.Sqrt(2), 10 / Functions.Sqrt(2), 0);
Assert.AreEqual(expectedPosition,
orbitingStand.Position, new Vector3EqualityComparer());
Assert.AreEqual(-expectedPosition.Normalized(), orbitingStand.Direction,
new Vector3EqualityComparer());
}