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java.lang.Objectcds.astro.Astroframe
cds.astro.Ecliptic
public class Ecliptic
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
Field Summary | |
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protected double |
equinox
The ecliptic frame is tightly connected to the Equatorial frame. |
protected double[][] |
fromJ2000
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Fields inherited from class cds.astro.Astroframe |
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base_epoch, ed_lat, ed_lon, epoch, hms, IAUframes, ICRSmatrix, name, precision |
Constructor Summary | |
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Ecliptic()
Instanciate an Ecliptic frame (at default J2000 equinox) |
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Ecliptic(double equinox)
Instanciate an Ecliptic frame. |
Method Summary | |
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double |
getEquinox()
Get the equinox |
double[][] |
toICRSmatrix()
Defines the rotation matrix to rotate to ICRS |
Methods inherited from class cds.astro.Astroframe |
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create, create, equals, equals, fromICRS, fromICRS, getEpoch, hashCode, isIAU, parse, setFrameEpoch, setICRSmatrix, toICRS, toICRS, toString, toString |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Field Detail |
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protected double equinox
protected double[][] fromJ2000
Constructor Detail |
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public Ecliptic(double equinox)
equinox
- the equinox of definition, in Julian Year.public Ecliptic()
Method Detail |
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public double[][] toICRSmatrix()
toICRSmatrix
in class Astroframe
public double getEquinox()
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