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/*
 *    Geotoolkit.org - An Open Source Java GIS Toolkit
 *    http://www.geotoolkit.org
 *
 *    (C) 1999-2012, Open Source Geospatial Foundation (OSGeo)
 *    (C) 2009-2012, Geomatys
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 */


/**
 * Algorithms related to the observations of natural phenomenons. Most algorithms in this package are
 * derived from empirical measurements; their results are approximative. Algorithms include:
 * 
 * 

 *   Sea water properties (density, sound velocity, fusion temperature,
 *       etc.) computed from salinity, temperature and pression
 *      using algorithms published by UNESCO.
 *   Values relative to earth calendar, like tropical year length.
 *   etc.
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 *  
 *  References

 *   Alain Poisson, M.H. Gashoumi and Selim Morcos.

 *          Salinity and density of seawater: table for high salinities (42 to 50).

 *                         Unesco technical papers in marine science #62 (1991).
 *   Unesco

 *          International oceanographic tables, volume 4.

 *                         Unesco technical papers in marine science #40 (1987).
 *   Franck J. Millero.

 *          Solubility of oxygen in sea water in Progress on oceanographic tables and standards 1983-1986.

 *                         Unesco technical papers in marine science #50 (1986) pp.13-14.
 *   Unesco

 *          The international system of units (SI) in oceanography.

 *                         Unesco technical papers in marine science #45 (1985).
 *   N.P. Fofonoff and R.C. Millard Jr.

 *          Algorithms for computation of fundamental properties of seawater.

 *                         Unesco technical papers in marine science #44 (1983).
 *   
 *      Tropical year length is computed
 *      using formula by Laskar (1986). Synodic month length is
 *      computed using formula by Chapront-Touze and Chapront (1988).
 *      Those formulas was taken from the following adress:

 *      
 *        
 *            http://webexhibits.org/calendars/year-astronomy.html
 *        
 *            http://www.treasure-troves.com/astro/TropicalYear.html
 *      
 *    
 *
 * @author Martin Desruisseaux (MPO, IRD)
 * @since 2.0
 *
 * @version 3.00
 * @module
 */
package org.geotoolkit.nature;