org.orekit.frames.configuration.precessionnutation
Interface PrecessionNutationModel

All Known Implementing Classes:

IERS20032010PrecessionNutation, NoPrecessionNutation, PrecessionNutationCache, StelaPrecessionNutationModel

public interface PrecessionNutationModel

This interface provides the Celestial Intermediate Pole motion (CIP) in the GCRS, those coordinates are used for the GCRF to CIRF transformation.

Version:

$Id: PrecessionNutationModel.java 7515 2013-01-30 09:37:35Z HoudrogeR $

Author:

Julie Anton

Method Summary

double[]	getCIPMotion(AbsoluteDate t) Compute the Celestial Intermediate pole motion in the GCRS.
double[]	getCIPMotionTimeDerivative(AbsoluteDate t) Compute the Celestial Intermediate pole motion in the GCRS.
boolean	isDirect() Return computation type : direct or interpolated.

Method Detail

getCIPMotion

double[] getCIPMotion(AbsoluteDate t)

Compute the Celestial Intermediate pole motion in the GCRS.

Parameters:

t - date

Returns:

CIP motion as an array of doubles

getCIPMotionTimeDerivative

double[] getCIPMotionTimeDerivative(AbsoluteDate t)

Compute the Celestial Intermediate pole motion in the GCRS.

Parameters:

t - date

Returns:

CIP motion time derivatives as an array of doubles

isDirect

boolean isDirect()

Return computation type : direct or interpolated.

Returns:

true if direct computation, false if interpolated