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OREKIT (ORbits Extrapolation KIT) is a low level space dynamics library. It provides basic elements (orbits, dates, attitude, frames ...) and various algorithms to handle them (conversions, analytical and numerical propagation, pointing ...).

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/* Copyright 2002-2022 CS GROUP
 * Licensed to CS GROUP (CS) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * CS licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.orekit.bodies;

import java.io.Serializable;

import org.hipparchus.CalculusFieldElement;
import org.hipparchus.geometry.euclidean.threed.FieldVector3D;
import org.hipparchus.geometry.euclidean.threed.Vector3D;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.FieldAbsoluteDate;

/** Interface for IAU pole and prime meridian orientations.
 * 
 * This interface defines methods compliant with the report of the
 * IAU/IAG Working Group on Cartographic Coordinates and Rotational
 * Elements of the Planets and Satellites (WGCCRE). These definitions
 * are common for all recent versions of this report published every
 * three years.
 * 
 * 
 * The precise values of pole direction and W angle coefficients may vary
 * from publication year as models are adjusted. The latest value of
 * constants for implementing this interface can be found in the working group
 * site.
 * 
 * @see CelestialBodies
 * @author Luc Maisonobe
 */
public interface IAUPole extends Serializable {

    /** Get the body North pole direction in ICRF frame.
     * @param date current date
     * @return body North pole direction in ICRF frame
     */
    Vector3D getPole(AbsoluteDate date);

    /** Get the body North pole direction in ICRF frame.
     * @param date current date
     * @param  type of the field elements
     * @return body North pole direction in ICRF frame
     * @since 9.0
     */
    > FieldVector3D getPole(FieldAbsoluteDate date);

    /** Get the body Q Node direction in ICRF frame.
     * @param date current date
     * @return body Q Node direction in ICRF frame
     * @since 9.1
     */
    default Vector3D getNode(AbsoluteDate date) {
        return Vector3D.crossProduct(Vector3D.PLUS_K, getPole(date));
    }

    /** Get the body Q Node direction in ICRF frame.
     * @param date current date
     * @param  type of the field elements
     * @return body Q Node direction in ICRF frame
     * @since 9.1
     */
    default > FieldVector3D getNode(FieldAbsoluteDate date) {
        return FieldVector3D.crossProduct(FieldVector3D.getPlusK(date.getField()), getPole(date));
    }

    /** Get the prime meridian angle.
     * 
     * The prime meridian angle is the angle between the Q node and the
     * prime meridian. represents the body rotation.
     * 
     * @param date current date
     * @return prime meridian vector
     */
    double getPrimeMeridianAngle(AbsoluteDate date);

    /** Get the prime meridian angle.
     * 
     * The prime meridian angle is the angle between the Q node and the
     * prime meridian. represents the body rotation.
     * 
     * @param date current date
     * @param  type of the field elements
     * @return prime meridian vector
     * @since 9.0
     */
    > T getPrimeMeridianAngle(FieldAbsoluteDate date);

}