Да.
Вот пример интерфейса
CAAElliptical::InstantaneousVelocity
static double InstantaneousVelocity(double r, double a)
Return Value
The instantaneous velocity of the object in kilometres per second.
Parameters
r The distance of the object from the Sun in astronomical units.
a The semi major axis of the orbit in astronomical units.
CAAElementsPlanetaryOribit::MercurySemimajorAxis
static double MercurySemimajorAxis(double JD)
Return Value
the semi major axis of the planet in astronomical units.
Parameters
JD The date in Dynamical time to calculate for.