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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.frames;

import java.io.Serializable;

import org.orekit.time.AbsoluteDate;
import org.orekit.time.TimeStamped;

/** This class holds an Earth Orientation Parameters entry.
 * @author Luc Maisonobe
 */
public class EOPEntry implements TimeStamped, Serializable {

    /** Serializable UID. */
    private static final long serialVersionUID = 20180330L;

    /** Entry date (modified julian day, 00h00 UTC scale). */
    private final int mjd;

    /** Entry date (absolute date). */
    private final AbsoluteDate date;

    /** UT1-UTC. */
    private final double dt;

    /** Length of day. */
    private final double lod;

    /** X component of pole motion. */
    private final double x;

    /** Y component of pole motion. */
    private final double y;

    /** Correction for nutation in longitude. */
    private final double ddPsi;

    /** Correction for nutation in obliquity. */
    private final double ddEps;

    /** Correction for nutation in Celestial Intermediate Pole (CIP) coordinates. */
    private final double dx;

    /** Correction for nutation in Celestial Intermediate Pole (CIP) coordinates. */
    private final double dy;

    /** ITRF version this entry defines. */
    private final ITRFVersion itrfType;

    /** Simple constructor.
     * @param mjd entry date (modified Julian day, 00h00 UTC scale)
     * @param dt UT1-UTC in seconds
     * @param lod length of day
     * @param x X component of pole motion
     * @param y Y component of pole motion
     * @param ddPsi correction for nutation in longitude δΔΨ
     * @param ddEps correction for nutation in obliquity δΔε
     * @param dx correction for Celestial Intermediate Pole (CIP) coordinates
     * @param dy correction for Celestial Intermediate Pole (CIP) coordinates
     * @param itrfType ITRF version this entry defines
     * @param date corresponding to {@code mjd}.
     * @since 10.1
     */
    public EOPEntry(final int mjd, final double dt, final double lod,
                    final double x, final double y,
                    final double ddPsi, final double ddEps,
                    final double dx, final double dy,
                    final ITRFVersion itrfType, final AbsoluteDate date) {

        this.mjd      = mjd;
        this.date     = date;
        this.dt       = dt;
        this.lod      = lod;
        this.x        = x;
        this.y        = y;
        this.ddPsi    = ddPsi;
        this.ddEps    = ddEps;
        this.dx       = dx;
        this.dy       = dy;
        this.itrfType = itrfType;

    }

    /** Get the entry date (modified julian day, 00h00 UTC scale).
     * @return entry date
     * @see #getDate()
     */
    public int getMjd() {
        return mjd;
    }

    /** {@inheritDoc} */
    public AbsoluteDate getDate() {
        return date;
    }

    /** Get the UT1-UTC value.
     * @return UT1-UTC in seconds
     */
    public double getUT1MinusUTC() {
        return dt;
    }

    /** Get the LoD (Length of Day) value.
     * @return LoD in seconds
     */
    public double getLOD() {
        return lod;
    }

    /** Get the X component of the pole motion.
     * @return X component of pole motion
     */
    public double getX() {
        return x;
    }

    /** Get the Y component of the pole motion.
     * @return Y component of pole motion
     */
    public double getY() {
        return y;
    }

    /** Get the correction for nutation in longitude δΔΨ.
     * @return correction for nutation in longitude  δΔΨ
     */
    public double getDdPsi() {
        return ddPsi;
    }

    /** Get the correction for nutation in obliquity δΔε.
     * @return correction for nutation in obliquity δΔε
     */
    public double getDdEps() {
        return ddEps;
    }

    /** Get the correction for Celestial Intermediate Pole (CIP) coordinates.
     * @return correction for Celestial Intermediate Pole (CIP) coordinates
     */
    public double getDx() {
        return dx;
    }

    /** Get the correction for Celestial Intermediate Pole (CIP) coordinates.
     * @return correction for Celestial Intermediate Pole (CIP) coordinates
     */
    public double getDy() {
        return dy;
    }

    /** Get the ITRF version this entry defines.
     * @return ITRF version this entry defines
     * @since 9.2
     */
    public ITRFVersion getITRFType() {
        return itrfType;
    }

}