casacore::MeasData Class Reference

MeasData provides Measure computing data. More...

#include <MeasData.h>

Static Public Member Functions
static const RotMatrix &	GALtoB1950 ()
	Get the rotation matrices for galactic coordinates. More...
static const RotMatrix &	GALtoJ2000 ()
static const RotMatrix &	J2000toGAL ()
static const RotMatrix &	B1950toGAL ()
static const RotMatrix &	MToB1950 (uInt which)
	Get one of the 4 3x3 sub rotation matrices for B1950-J2000 conversions. More...
static const RotMatrix &	MToJ2000 (uInt which)
static Double	SunSemiDiameter ()
	Get the solar semi diameter at 1 AU in rad. More...
static Double	eps0J2000 ()
	J2000 obliquity. More...

Static Public Attributes
static const Double	MJD2000
	General constants. More...
static const Double	MJDB1950
	MJD of B1950.0. More...
static const Double	MJDB1900
	MJD of B1900.0. More...
static const Double	MJDB1850
	MJD of B1850.0. More...
static const Double	TROPCEN
	Length Tropical century. More...
static const Double	JDCEN
	Length Julian century. More...
static const Double	SECinDAY
	Length of day in sec. More...

Private Member Functions
	MeasData ()
	Default constructor, NOT defined. More...
MeasData &	operator= (const MeasData &other)
	Copy assign, NOT defined. More...

Detailed Description

MeasData provides Measure computing data.

Intended use:

Internal

Review Status

Reviewed By:

UNKNOWN

Date Reviewed:

before2004/08/25

Test programs:

tMeasMath

Prerequisite

• Measure class

Etymology

MeasData from Measure and Data

Synopsis

MeasData contains the constant data necessary for precession, nutation and other Measure related calculations.
Database (Table) related data, or data that can be changed by the user, is available in the MeasTable class.
All data. apart from a set of simple constants:

MeasData::MJD2000
MeasData::MJDB1950 
MeasData::MJDB1900 
MeasData::MJDB1850 
MeasData::TROPCEN 
MeasData::JDCEN 
MeasData::SECinDAY

are obtained by calls to a method. This class contains no constructors or destructors, only static methods and (static) constants.
References:
Explanatory supplements to the Astronomical Almanac
C. Ron and J. Vondrak, Bull. Astron. Inst. Czechosl. 37, p96, 1986
M. Soma, Th. Hirayama and H. Kinoshita, Celest. Mech. 41, p389, 1988
V.S. Gubanov, Astron. Zh. 49, p1112, 1972 (English translation: Sov. Astronomy - AJ, Vol. 16, No. 5, p. 907)

Example

Usage examples can be found in Precession

Motivation

To create a clean interface between the actual calculations and the methods to obtain the parameters for these calculations. Note that the tables are in general in the format and units found in the literature. This is to be able to easy check and change them. However, in the future re-arrangement could produce faster and more compact code.

To Do

• more precise data for VLBI and pulsar

Definition at line 99 of file MeasData.h.

Constructor & Destructor Documentation

casacore::MeasData::MeasData ( )

private

Default constructor, NOT defined.

Member Function Documentation

static const RotMatrix& casacore::MeasData::B1950toGAL ( )

static

static Double casacore::MeasData::eps0J2000 ( )

static

J2000 obliquity.

static const RotMatrix& casacore::MeasData::GALtoB1950 ( )

static

Get the rotation matrices for galactic coordinates.

static const RotMatrix& casacore::MeasData::GALtoJ2000 ( )

static

static const RotMatrix& casacore::MeasData::J2000toGAL ( )

static

static const RotMatrix& casacore::MeasData::MToB1950 ( uInt  which )

static

Get one of the 4 3x3 sub rotation matrices for B1950-J2000 conversions.

static const RotMatrix& casacore::MeasData::MToJ2000 ( uInt  which )

static

MeasData& casacore::MeasData::operator= ( const MeasData &  other )

private

Copy assign, NOT defined.

static Double casacore::MeasData::SunSemiDiameter ( )

static

Get the solar semi diameter at 1 AU in rad.

Member Data Documentation

const Double casacore::MeasData::JDCEN

static

Length Julian century.

Definition at line 117 of file MeasData.h.

const Double casacore::MeasData::MJD2000

static

General constants.

MJD of J2000.0

Definition at line 107 of file MeasData.h.

const Double casacore::MeasData::MJDB1850

static

MJD of B1850.0.

Definition at line 113 of file MeasData.h.

const Double casacore::MeasData::MJDB1900

static

MJD of B1900.0.

Definition at line 111 of file MeasData.h.

const Double casacore::MeasData::MJDB1950

static

MJD of B1950.0.

Definition at line 109 of file MeasData.h.

const Double casacore::MeasData::SECinDAY

static

Length of day in sec.

Definition at line 119 of file MeasData.h.

const Double casacore::MeasData::TROPCEN

static

Length Tropical century.

Definition at line 115 of file MeasData.h.

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The documentation for this class was generated from the following file:

• casa/casacore/measures/Measures/MeasData.h