skyview.geometry.csys

Class PositionAngleConverter

java.lang.Object

skyview.geometry.csys.PositionAngleConverter

public class PositionAngleConverter
extends java.lang.Object

This class implements an algorithm that calculates the offsets between the position angle expressed with respect to the poles in two different coordinate systems. If we transform between coordinate systems we are likely to want to express position angles with reference to the poles in the new coordinates, rather than the pole in the old coordinate system.

Constructor Summary

Constructors

Constructor and Description
PositionAngleConverter(CoordinateSystem input, CoordinateSystem output)

Method Summary

Modifier and Type	Method and Description
double	getOffsetAngle(double[] unitIn) Calculate the offset between the position angles in the two coordinate systems at the point defined by the input unit vector (presumed to be in the input coordinate system).
static void	main(java.lang.String[] args) Main program for testing.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PositionAngleConverter

public PositionAngleConverter(CoordinateSystem input,
                              CoordinateSystem output)
                       throws TransformationException

Throws:

TransformationException

Method Detail

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Main program for testing. Usage: PositionAngleConverter -- Defaults to J2000 to Galactic or PositionAngleConverter output -- input defaults to J2000 or PositionAngleConverter input output

Throws:

java.lang.Exception

getOffsetAngle

public double getOffsetAngle(double[] unitIn)

Calculate the offset between the position angles in the two coordinate systems at the point defined by the input unit vector (presumed to be in the input coordinate system).