cds.astro
Class Ecliptic

java.lang.Object
  cds.astro.Astroframe
      cds.astro.Ecliptic

All Implemented Interfaces:

java.io.Serializable

public class Ecliptic
extends Astroframe

The ecliptic frame is defined such that the Sun has a latitude = 0. Since the obliquity of the Earth's axis is slightly changing with time, the relation between the Equatorial and Ecliptic frames vary with time. The J2000 value of the obliquity is in Hipparcos vol. 1, table 1.1.2 The fomulae used here refer to Earth Ephemeris VSOP 82/ELP 2000

Author:

Francois Ochsenbein (CDS)

See Also:

Serialized Form

Field Summary

Fields inherited from class cds.astro.Astroframe

base_epoch, ed_lat, ed_lon, epoch, hms, ICRSmatrix, name, precision

Constructor Summary

Ecliptic()
Instanciate an Ecliptic frame (at default J2000 equinox)

Ecliptic(double equinox)
Instanciate an Ecliptic frame.

Method Summary

double[][]

toICRSmatrix() Defines the rotation matrix to rotate to ICRS

Methods inherited from class cds.astro.Astroframe

equals, fromICRS, fromICRS, setFrameEpoch, setICRSmatrix, toICRS, toICRS, toString, toString

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Ecliptic

public Ecliptic(double equinox)

Instanciate an Ecliptic frame. For non-standard default epoch, use setFrameEpoch() method.

Parameters:

equinox - the equinox of definition, in Julian Year.

Ecliptic

public Ecliptic()

Instanciate an Ecliptic frame (at default J2000 equinox)

Method Detail

toICRSmatrix

public double[][] toICRSmatrix()

Defines the rotation matrix to rotate to ICRS

Specified by:

toICRSmatrix in class Astroframe

Returns:

the 3x3 rotation matrix to convert a position to ICRS frame