skyview.geometry.csys

Class Helioecliptic

java.lang.Object

skyview.geometry.CoordinateSystem

skyview.geometry.csys.Ecliptic

skyview.geometry.csys.Helioecliptic

All Implemented Interfaces:

java.io.Serializable, Component

public class Helioecliptic
extends Ecliptic
implements Component

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.

See Also:

Serialized Form

Field Summary

Fields inherited from class skyview.geometry.CoordinateSystem

B1950, Gal, ICRS, J2000

Constructor Summary

Constructors

Constructor and Description
Helioecliptic(double epoch) Get a coordinate system at a given epoch.

Method Summary

Modifier and Type	Method and Description
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 skyview.geometry.csys.Ecliptic

getRotater

Methods inherited from class skyview.geometry.CoordinateSystem

factory, factory, getSphereDistorter

Methods inherited from class java.lang.Object

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

Constructor Detail

Helioecliptic

public Helioecliptic(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 Component

Overrides:

getName in class Ecliptic

getDescription

public java.lang.String getDescription()

Get a description of the component.

Specified by:

getDescription in interface Component

Overrides:

getDescription in class Ecliptic

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).