skyview.geometry.csys

Class Besselian

java.lang.Object

skyview.geometry.CoordinateSystem

skyview.geometry.csys.Besselian

All Implemented Interfaces:

java.io.Serializable, Component

public class Besselian
extends CoordinateSystem
implements Component

This class implements Besselian coordinate systems. These systems are not simple rotations from the reference coordinate frame. These coordinate systems are implemented such that the rotation matrix is appropriate for J2000 coordinates but the rectify and derectify function perform transformation from/to Besselian coordinates. The transformations do not use any proper motion or distance information supplied by the user. The methods in this class are based on P. Wallaces SLA library substantially modified for use within Java and SkyView.

See Also:

Serialized Form

Field Summary

Fields inherited from class skyview.geometry.CoordinateSystem

B1950, Gal, ICRS, J2000

Constructor Summary

Constructors

Constructor and Description
Besselian(double epoch) Get a CoordinateSystem of a given epoch.

Method Summary

Modifier and Type	Method and Description
java.lang.String	getDescription() Get the description of this component.
java.lang.String	getName() Get the name of this component.
Rotater	getRotater() Get the rotation associated with the projection.
SphereDistorter	getSphereDistorter() Get the distortion associated with the projection.
boolean	isRotation() This coordinate system is not just a rotation away from the reference frame.

Methods inherited from class skyview.geometry.CoordinateSystem

factory, factory

Methods inherited from class java.lang.Object

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

Constructor Detail

Besselian

public Besselian(double epoch)

Get a CoordinateSystem of a given epoch.

Parameters:

epoch - The epoch as a calendar year (possibly fractional).

Method Detail

isRotation

public boolean isRotation()

This coordinate system is not just a rotation away from the reference frame.

getName

public java.lang.String getName()

Description copied from interface: Component

Get the name of this component.

Specified by:

getName in interface Component

getDescription

public java.lang.String getDescription()

Description copied from interface: Component

Get the description of this component.

Specified by:

getDescription in interface Component

getRotater

public Rotater getRotater()

Description copied from class: CoordinateSystem

Get the rotation associated with the projection.

Specified by:

getRotater in class CoordinateSystem

getSphereDistorter

public SphereDistorter getSphereDistorter()

Description copied from class: CoordinateSystem

Get the distortion associated with the projection. By default there is no distortion, but subclasses, notably BesselianProjection, can override this.

Overrides:

getSphereDistorter in class CoordinateSystem