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java.lang.Object skyview.geometry.CoordinateSystem skyview.geometry.csys.JulianCoordinateSystem
public class JulianCoordinateSystem
The class defining Julian coordinate systems. The reference coordinate system is J2000. We use the FK5 coordinate frame as the realization of the Julian coordinate system. At the 50 milliarcsecond level this is not valid: There is an offset of J2000 and FK5. However the details of this offset are still somewhat unclear, so we use the better defined frame.
Field Summary |
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Fields inherited from class skyview.geometry.CoordinateSystem |
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B1950, Galactic, ICRS, J2000 |
Constructor Summary | |
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JulianCoordinateSystem(double epoch)
Get a Julian CoordinateSystem of a given epoch. |
Method Summary | |
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java.lang.String |
getDescription()
Get a description of the object. |
java.lang.String |
getName()
Get the name of this object. |
Rotater |
getRotater()
Return the rotation associated with the coordinate system. |
Rotater |
precession()
Get the Julian Precession Matrix for a given epoch (from J2000). |
Methods inherited from class skyview.geometry.CoordinateSystem |
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factory, getSphereDistorter |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public JulianCoordinateSystem(double epoch)
epoch
- The epoch of the equinox of the coordinates in calendar
years (possibly fractional).Method Detail |
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public java.lang.String getName()
getName
in interface Component
public java.lang.String getDescription()
getDescription
in interface Component
public Rotater getRotater()
getRotater
in class CoordinateSystem
public Rotater precession()
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