Main.java Source code

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//package com.java2s;
/*
 * Copyright (C) 2010 Brockmann Consult GmbH (info@brockmann-consult.de)
 *
 * 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 3 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, see http://www.gnu.org/licenses/
 */

public class Main {
    /**
     * Returns the correction factor for the solar irradiance due to the elliptical
     * orbit of the Sun.
     *
     * @param day the day (of year) of interest.
     *
     * @return the correction factor.
     */
    public static double getSolarIrradianceCorrectionFactor(int day) {
        final double d = 1.0 - 0.01673 * Math.cos(Math.toRadians(0.9856 * (day - 4)));

        return 1.0 / (d * d);
    }
}