public void GetMoonIllumination_returns_angle_of_moons_illuminated_limb()
        {
            var moonIllumination = MoonCalc.GetMoonIllumination(_date);

            moonIllumination.Angle.Should().BeApproximately(1.6732942678578346, 1e-15);
        }
        public void GetMoonIllumination_returns_phase_of_moon()
        {
            var moonIllumination = MoonCalc.GetMoonIllumination(_date);

            moonIllumination.Phase.Should().Be(MoonPhase.WaningCrescent);
        }
        public void GetMoonIllumination_returns_fraction_of_moons_illuminated_limb()
        {
            var moonIllumination = MoonCalc.GetMoonIllumination(_date);

            moonIllumination.Fraction.Should().BeApproximately(0.4848068202456373, 1e-15);
        }