public static double semimajorAxis(Orbit orbit)
{
throw new System.NotImplementedException();
}
public static double timeFromPeriapsis(Orbit orbit)
{
throw new System.NotImplementedException();
}
public static double timeFromPeriapsis(Orbit orbit)
{
double ea = eccentricAnomaly(orbit);
return Math.Pow(orbit.semimajorAxis, 1.5) / orbit.mainBody.gravParameter.sqrt() * (ea - orbit.eccentricity * Math.Sin(ea));
}
private static double eccentricAnomaly(Orbit orbit)
{
return 2 * Math.Atan(((1 - orbit.eccentricity) / (1 + orbit.eccentricity)).sqrt() * Math.Tan(orbit.trueAnomaly / 2));
}
public static double semimajorAxis(Orbit orbit)
{
return orbit.parameter / (1 - orbit.eccentricity.sqr());
}