agi.foundation.celestial

(agi.foundation.models-2025r1.jar)

Class Iau2006XysData

java.lang.Object

agi.foundation.celestial.Iau2006XysData

public final class Iau2006XysData
extends Object

A table of IAU2006 XYS data that is used to evaluate the transformation between the International Celestial Reference Frame (ICRF) and the International Terrestrial Reference Frame (ITRF). It is usually preferable to use the ReferenceFrame instances on EarthCentralBody rather than using this table directly.

Method Summary

Modifier and Type	Method and Description
JulianDate	getDateOfLastSample() Gets the date of the last sample in the table.
static Iau2006XysData	getInstance() Gets the instance of the embedded IAU2006 XYS data.
int	getInterpolationOrder() Gets the order of the Lagrange polynomial to use to interpolate the data in the table.
int	getNumberOfPoints() Gets the total number of samples in the XYS table.
JulianDate	getReferenceEpoch() Gets the ReferenceEpochJulianEphemerisDate (get) expressed as a JulianDate.
double	getReferenceEpochJulianEphemerisDate() Gets the Julian Ephemeris Date (JED) of the first sample in the table.
double	getStepSizeDays() Gets the step between samples in the table, in days.
String	getUpdated() Gets a string containing the date on which the XYS data in the table was last updated.
String	getVersion() Gets the version of the XYS data.
List<Double>	getXys() Gets the XYS table, in the order X0, Y0, S0, X1, Y1, S1, etc.
String	getXysAlgorithm() Gets the name of the algorithm used to generate the data held in the XYS table.

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

@Nonnull
public static Iau2006XysData getInstance()

Gets the instance of the embedded IAU2006 XYS data.

getVersion

@Nonnull
public final String getVersion()

Gets the version of the XYS data.

getUpdated

@Nonnull
public final String getUpdated()

Gets a string containing the date on which the XYS data in the table was last updated.

getInterpolationOrder

public final int getInterpolationOrder()

Gets the order of the Lagrange polynomial to use to interpolate the data in the table.

getReferenceEpochJulianEphemerisDate

public final double getReferenceEpochJulianEphemerisDate()

Gets the Julian Ephemeris Date (JED) of the first sample in the table. Julian Ephemeris Dates are in the TerrestrialTime (get) standard.

getReferenceEpoch

@Nonnull
public final JulianDate getReferenceEpoch()

Gets the ReferenceEpochJulianEphemerisDate (get) expressed as a JulianDate.

getStepSizeDays

public final double getStepSizeDays()

Gets the step between samples in the table, in days.

getNumberOfPoints

public final int getNumberOfPoints()

Gets the total number of samples in the XYS table.

getXysAlgorithm

@Nonnull
public final String getXysAlgorithm()

Gets the name of the algorithm used to generate the data held in the XYS table. This algorithm takes the fundamental arguments and astronomical standards and computes the XYS values from the series approximations from ICRF theory.

getXys

@Nonnull
public final List<Double> getXys()

Gets the XYS table, in the order X0, Y0, S0, X1, Y1, S1, etc.

getDateOfLastSample

@Nonnull
public final JulianDate getDateOfLastSample()

Gets the date of the last sample in the table.