org.jscience.astronomy.solarsystem.coordinates.coordinatesystems
Class HelioeclipticCoordinateSystem

java.lang.Object
  org.jscience.astronomy.solarsystem.coordinates.CoordinateSystem
      org.jscience.astronomy.solarsystem.coordinates.coordinatesystems.EclipticCoordinateSystem
          org.jscience.astronomy.solarsystem.coordinates.coordinatesystems.HelioeclipticCoordinateSystem

All Implemented Interfaces:

Named

public class HelioeclipticCoordinateSystem
extends EclipticCoordinateSystem
implements Named

A helioecliptic coordinate system at a given epoch. This gives a coordinate system where the Sun is at the center of the coordinate system. We assume that the same epoch is to be used to get the position of the Sun and the basis Ecliptic coordinate system.

Field Summary

Fields inherited from class org.jscience.astronomy.solarsystem.coordinates.CoordinateSystem

B1950, Galactic, ICRS, J2000

Constructor Summary

HelioeclipticCoordinateSystem(double epoch)
Get a coordinate system at a given epoch.

Method Summary

java.lang.String	getDescription() Get a description of the component.
java.lang.String	getName() Get the name of the component.
static double	sunlong(double epoch) Find the ecliptic longitude of the Sun at a given epoch.

Methods inherited from class org.jscience.astronomy.solarsystem.coordinates.coordinatesystems.EclipticCoordinateSystem

getRotater

Methods inherited from class org.jscience.astronomy.solarsystem.coordinates.CoordinateSystem

factory, factory, getSphereDistorter

Methods inherited from class java.lang.Object

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

Constructor Detail

HelioeclipticCoordinateSystem

public HelioeclipticCoordinateSystem(double epoch)

Get a coordinate system at a given epoch.

Parameters:

epoch - The desired epoch

Method Detail

getName

public java.lang.String getName()

Get the name of the component.

Specified by:

getName in interface Named

Overrides:

getName in class EclipticCoordinateSystem

Returns:

DOCUMENT ME!

getDescription

public java.lang.String getDescription()

Get a description of the component.

Overrides:

getDescription in class EclipticCoordinateSystem

sunlong

public static double sunlong(double epoch)

Find the ecliptic longitude of the Sun at a given epoch. Algorithm derived (and simplified) from the IDL Astronomy library sunpos (C.D. Pike, B. Emerson).

Parameters:

Epoch - (in years).