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 Description

Besselian(double epoch)
Get a CoordinateSystem of a given epoch.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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