public void VenusPerihelionTest(double year, double expectedPerihelion)
        {
            long   k          = AASPlanetPerihelionAphelion.VenusK(year);
            double perihelion = AASPlanetPerihelionAphelion.VenusPerihelion(k);

            Assert.Equal(expectedPerihelion, perihelion);
        }
        public void VenusKTest(double year, long expectedK)
        {
            long k = AASPlanetPerihelionAphelion.VenusK(year);

            Assert.Equal(expectedK, k);
        }