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predict4java provides real-time satellite tracking and orbital prediction information
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/**
    predict4java: An SDP4 / SGP4 library for satellite orbit predictions

    Copyright (C)  2004-2010  David A. B. Johnson, G4DPZ.

    This class is a Java port of one of the core elements of
    the Predict program, Copyright John A. Magliacane,
    KD2BD 1991-2003: http://www.qsl.net/kd2bd/predict.html

    Dr. T.S. Kelso is the author of the SGP4/SDP4 orbital models,
    originally written in Fortran and Pascal, and released into the
    public domain through his website (http://www.celestrak.com/).
    Neoklis Kyriazis, 5B4AZ, later re-wrote Dr. Kelso's code in C,
    and released it under the GNU GPL in 2002.
    PREDICT's core is based on 5B4AZ's code translation efforts.

    Author: David A. B. Johnson, G4DPZ 

    Comments, questions and bugreports should be submitted via
    http://sourceforge.net/projects/websat/
    More details can be found at the project home page:

    http://websat.sourceforge.net

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, visit http://www.fsf.org/
 */
package uk.me.g4dpz.satellite;

import java.io.Serializable;
import java.text.SimpleDateFormat;
import java.util.Date;

public class SatPassTime implements Serializable {

    private static final long serialVersionUID = -6408342316986801301L;

    private Date startTime;
    private Date endTime;
    private Date tca;
    private String polePassed;
    private int aos;
    private int los;
    private double maxEl;

    private static final String NEW_LINE = "\n";
    private static final String DEG_NL = " deg.\n";

    private static final SimpleDateFormat TIME_FORMAT = new SimpleDateFormat("h:mm a");
    private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("MMMMMM d, yyyy");

    public SatPassTime(final Date startTime, final Date endTime, final String polePassed,
            final int aos, final int los, final double maxEl) {
        new SatPassTime(
                startTime,
                endTime,
                new Date((startTime.getTime() + endTime.getTime()) / 2),
                polePassed,
                aos,
                los,
                maxEl);
    }

    public SatPassTime() {
    }

    public SatPassTime(final Date startTime, final Date endTime, final Date tca, final String polePassed,
            final int aosAzimuth, final int losAzimuth,
            final double maxEl) {
        // TODO Auto-generated constructor stub
        this.startTime = new Date(startTime.getTime());
        this.endTime = new Date(endTime.getTime());
        this.polePassed = polePassed;
        this.aos = aosAzimuth;
        this.los = losAzimuth;
        this.maxEl = maxEl;
        this.tca = new Date(tca.getTime());
    }

    public final Date getStartTime() {
        return new Date(startTime.getTime());
    }

    public final Date getEndTime() {
        return new Date(endTime.getTime());
    }

    public final Date getTCA() {
        return new Date(tca.getTime());
    }

    public final void setTCA(final Date theTCA) {
        this.tca = theTCA;
    }

    public final String getPolePassed() {
        return polePassed;
    }

    /**
     * @return the aos azimuth
     */
    public final int getAosAzimuth() {
        return aos;
    }

    /**
     * @return the los azimuth
     */
    public final int getLosAzimuth() {
        return los;
    }

    /**
     * @return the maxEl
     */
    public final double getMaxEl() {
        return maxEl;
    }

    /**
     * Returns a string representing the contents of the object.
     */
    @Override
    public String toString() {

        final double duration = (endTime.getTime() - startTime.getTime()) / 60000.0;

        return "Date: " + DATE_FORMAT.format(startTime)
                + NEW_LINE
                + "Start Time: "
                + TIME_FORMAT.format(startTime)
                + NEW_LINE
                +
                // "End Time: " + mTimeFormatter.format(endDate_time) + "\n" +
                String.format("Duration: %4.1f min.\n", duration)
                + "AOS Azimuth: " + aos + DEG_NL
                + String.format("Max Elevation: %4.1f deg.\n", maxEl)
                + "LOS Azimuth: " + los + " deg.";
    }
}