Android Year Offset Get deltaTimeCurrentCentury(int year)

Description

Calculates the difference between the Universal Time and the Terrestrial Time (also known as Dynamical Time) given a year within the 21st century.

License

Open Source License

Parameter

Parameter	Description
year	year within the current century.

Declaration

public static double deltaTimeCurrentCentury(int year) 

Method Source Code

//package com.java2s;
/*/*www  . j  ava2s .  c o  m*/
 * Copyright (C) 2011-2012 Inaki Ortiz de Landaluce Saiz
 * 
 * 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 Lesser General Public 
 * License along with this program. If not, see 
 * <http://www.gnu.org/licenses/>
 */

public class Main {
    /**
     * Calculates the difference between the Universal Time and the Terrestrial
     * Time (also known as Dynamical Time) given a year within the 21st century.
     * The exact value of such difference can be deduced only from observations.
     * However an approximate value can be obtained through interpolation by
     * means of an expression due to Chapront and Francou and issued by the
     * Bureau des Longitudes in Paris on December 1977.
     * 
     * @param year
     *            year within the current century.
     */
    public static double deltaTimeCurrentCentury(int year) {
        // calculate time measured in centuries from epoch 2000.0
        double t = (double) (year - 2000) / 100;
        return (102 + 102 * t + 25.3 * t * t + (year - 2100) * 0.37);
    }
}

Related

1. hasYearPassed(int year)
2. yearOffset(Date date, int offset)
3. getOneYearAgo()
4. yearDays(int y)