public void MarsAphelionTest(double year, double expectedAphelion)
        {
            long   k        = AASPlanetPerihelionAphelion.MarsK(year);
            double aphelion = AASPlanetPerihelionAphelion.MarsAphelion(k);

            Assert.Equal(expectedAphelion, aphelion);
        }
        public void MarsKTest(double year, long expectedK)
        {
            long k = AASPlanetPerihelionAphelion.MarsK(year);

            Assert.Equal(expectedK, k);
        }