VSOPTOP2013 1.0.0

VSOP/TOP2013

An implementation of the analytic planetary solutions published by G. Francou and J. L. Simon of the Paris Observatory. For a given date and time from -4000 to +8000, returns the position and velocity of any planet 1-9 using VSOP or 5-9 using TOP. VSOP/TOP2013 is a CLS-compliant library targeted to .NET Standard 2.0.

How to Use

A Planet object may be obtained by index or name. Then the Position method may be called with the desired Barycentric Dynamical Time (TDB) expressed as a Julian date. The method returns an orbital coordinate containing position and velocity of the planet at that time. Examples:

// Construct by 1-based index. VSOP is the default solution.
Planet myPlanet = new Planet(2);

// Construct by enumerated index.
Planet myPlanet = new Planet(Planets.Venus);

// Construct by name.
Planet myPlanet = new Planet("Venus");

// Construct by name and specify TOP solution. Valid only for the outer planets.
Planet myPlanet = new Planet("Saturn", true);

// Call Position method for TDB 2411545 and return result in J2000.0 ecliptical coordinates.
OrbitalCoordinate myCoordinate = myPlanet.Position(2411545, Frame.J2000);
Console.Write(myCoordinate);

	// X: -8.51511074854885, Y: 3.69589695443049, Z: 0.272426618537697
	// VelocityX: -0.00251503644983892, VelocityY: -0.00512845140735252, VelocityZ: 0.000190225351577721
	// Frame: J2000

// Call Position method for TDB 2459543.5 and return result in ICRF equatorial coordinates.
OrbitalCoordinate myCoordinate = myPlanet.Position(2459543.5, Frame.ICRF);
Console.Write(myCoordinate);

	// X: 6.82294199648418, Y: -6.55672280255307, Z: -3.00201564910881
	// VelocityX: 0.00374508722196133, VelocityY: 0.00359950179347434, VelocityZ: 0.00132560239628805
	// Frame: ICRF