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MeasData.h
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00001 //# MeasData.h: MeasData provides Measure computing data
00002 //# Copyright (C) 1995,1996,1997,1999,2003
00003 //# Associated Universities, Inc. Washington DC, USA.
00004 //#
00005 //# This library is free software; you can redistribute it and/or modify it
00006 //# under the terms of the GNU Library General Public License as published by
00007 //# the Free Software Foundation; either version 2 of the License, or (at your
00008 //# option) any later version.
00009 //#
00010 //# This library is distributed in the hope that it will be useful, but WITHOUT
00011 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00012 //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00013 //# License for more details.
00014 //#
00015 //# You should have received a copy of the GNU Library General Public License
00016 //# along with this library; if not, write to the Free Software Foundation,
00017 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
00018 //#
00019 //# Correspondence concerning AIPS++ should be addressed as follows:
00020 //#        Internet email: aips2-request@nrao.edu.
00021 //#        Postal address: AIPS++ Project Office
00022 //#                        National Radio Astronomy Observatory
00023 //#                        520 Edgemont Road
00024 //#                        Charlottesville, VA 22903-2475 USA
00025 //#
00026 //#
00027 //# $Id: MeasData.h 20739 2009-09-29 01:15:15Z Malte.Marquarding $
00028 
00029 #ifndef MEASURES_MEASDATA_H
00030 #define MEASURES_MEASDATA_H
00031 
00032 //# Includes
00033 #include <casa/aips.h>
00034 
00035 namespace casa { //# NAMESPACE CASA - BEGIN
00036 
00037 //# Forward Declarations
00038 class RotMatrix;
00039 
00040 // <summary>
00041 // MeasData provides Measure computing data
00042 // </summary>
00043 
00044 // <use visibility=local>
00045 
00046 // <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="tMeasMath" demos="">
00047 // </reviewed>
00048 
00049 // <prerequisite>
00050 //   <li> <linkto class=Measure>Measure</linkto> class 
00051 // </prerequisite>
00052 //
00053 // <etymology>
00054 // MeasData from Measure and Data
00055 // </etymology>
00056 //
00057 // <synopsis>
00058 // MeasData contains the constant data 
00059 // necessary for precession, nutation and other 
00060 // <linkto class=Measure>Measure</linkto> related calculations.<br>
00061 // Database (Table) related data, or data that can be changed by the user,
00062 // is available in the <linkto class=MeasTable>MeasTable</linkto> class. <br>
00063 // All data. apart from a set of simple constants:
00064 // <srcblock>
00065 //      MeasData::MJD2000
00066 //      MeasData::MJDB1950 
00067 //      MeasData::MJDB1900 
00068 //      MeasData::MJDB1850 
00069 //      MeasData::TROPCEN 
00070 //      MeasData::JDCEN 
00071 //      MeasData::SECinDAY
00072 // </srcblock>
00073 // are obtained by calls to a method.
00074 // This class contains no constructors or destructors, only static
00075 // methods and (static) constants.
00076 // <br> References:<br> Explanatory supplements to the Astronomical Almanac
00077 // <br> C. Ron and J. Vondrak, Bull. Astron. Inst. Czechosl. 37, p96, 1986
00078 // <br> M. Soma, Th. Hirayama and H. Kinoshita, Celest. Mech. 41, p389, 1988
00079 // <br> V.S. Gubanov, Astron. Zh. 49, p1112, 1972 (English translation:
00080 //      Sov. Astronomy - AJ, Vol. 16, No. 5, p. 907)
00081 // </synopsis>
00082 //
00083 // <example>
00084 // Usage examples can be found in <linkto class=Precession>Precession</linkto>
00085 // </example>
00086 //
00087 // <motivation>
00088 // To create a clean interface between the actual calculations and the
00089 // methods to obtain the parameters for these calculations. Note that the
00090 // tables are in general in the format and units found in the literature. This
00091 // is to be able to easy check and change them. However, in the future
00092 // re-arrangement could produce faster and more compact code.
00093 // </motivation>
00094 //
00095 // <todo asof="1997/04/17">
00096 //   <li> more precise data for VLBI and pulsar
00097 // </todo>
00098 
00099 class MeasData {
00100 
00101 public:
00102   
00103   //#   Constants
00104   // General constants
00105   // <group>
00106   // MJD of J2000.0
00107   static const Double MJD2000;
00108   // MJD of B1950.0
00109   static const Double MJDB1950;
00110   // MJD of B1900.0
00111   static const Double MJDB1900;
00112   // MJD of B1850.0
00113   static const Double MJDB1850;
00114   // Length Tropical century
00115   static const Double TROPCEN;
00116   // Length Julian century
00117   static const Double JDCEN;
00118   // Length of day in sec
00119   static const Double SECinDAY;
00120   // </group>
00121   
00122   //# General Member Functions
00123 
00124   // Get the rotation matrices for galactic coordinates
00125   // <group>
00126   static const RotMatrix &GALtoB1950();
00127   static const RotMatrix &GALtoJ2000();
00128   static const RotMatrix &J2000toGAL();
00129   static const RotMatrix &B1950toGAL();
00130   // </group>
00131 
00132   // Get one of the 4 3x3 sub rotation matrices for B1950-J2000 conversions
00133   // <group>
00134   static const RotMatrix &MToB1950(uInt which);
00135   static const RotMatrix &MToJ2000(uInt which);
00136   // </group>
00137 
00138   // Get the solar semi diameter at 1 AU in rad
00139   static Double SunSemiDiameter();
00140 
00141   // J2000 obliquity
00142   static Double eps0J2000();
00143   
00144 private:
00145   
00146   //# Constructors
00147   // Default constructor, NOT defined
00148   MeasData();
00149   
00150   // Copy assign, NOT defined
00151   MeasData &operator=(const MeasData &other);
00152   
00153   //# Destructor
00154   //  Destructor (NOT defined) and not declared to stop warning
00155   // ~MeasData();
00156   //# General member functions
00157 };
00158 
00159 
00160 } //# NAMESPACE CASA - END
00161 
00162 #endif