All Known Implementing Classes:

AbstractTimeScales, LazyLoadedTimeScales
```
public interface TimeScales
```
A collection of TimeScales. This interface defines methods for obtaining instances of many common time scales.

Since:

10.1

Author:

Luc Maisonobe, Evan Ward

See Also:

TimeScalesFactory, TimeScale, LazyLoadedTimeScales, of(Collection, BiFunction)

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`AbsoluteDate`	`createBesselianEpoch(double besselianEpoch)`	Build an instance corresponding to a Besselian Epoch (BE).
`AbsoluteDate`	`createJulianEpoch(double julianEpoch)`	Build an instance corresponding to a Julian Epoch (JE).
`BDTScale`	`getBDT()`	Get the BeiDou Navigation Satellite System time scale.
`AbsoluteDate`	`getBeidouEpoch()`	Reference epoch for BeiDou weeks: 2006-01-01T00:00:00 UTC.
`AbsoluteDate`	`getCcsdsEpoch()`	Reference epoch for CCSDS Time Code Format (CCSDS 301.0-B-4): 1958-01-01T00:00:00 International Atomic Time (not UTC).
`AbsoluteDate`	`getFiftiesEpoch()`	Reference epoch for 1950 dates: 1950-01-01T00:00:00 Terrestrial Time.
`AbsoluteDate`	`getFutureInfinity()`	Dummy date at infinity in the future direction.
`AbsoluteDate`	`getGalileoEpoch()`	Reference epoch for Galileo System Time: 1999-08-22T00:00:00 GST.
`GLONASSScale`	`getGLONASS()`	Get the GLObal NAvigation Satellite System time scale.
`AbsoluteDate`	`getGlonassEpoch()`	Reference epoch for GLONASS four-year interval number: 1996-01-01T00:00:00 GLONASS time.
`GMSTScale`	`getGMST(IERSConventions conventions, boolean simpleEOP)`	Get the Greenwich Mean Sidereal Time scale.
`GPSScale`	`getGPS()`	Get the Global Positioning System scale.
`AbsoluteDate`	`getGpsEpoch()`	Reference epoch for GPS weeks: 1980-01-06T00:00:00 GPS time.
`GalileoScale`	`getGST()`	Get the Galileo System Time scale.
`IRNSSScale`	`getIRNSS()`	Get the Indian Regional Navigation Satellite System time scale.
`AbsoluteDate`	`getIrnssEpoch()`	Reference epoch for IRNSS weeks: 1999-08-22T00:00:00 IRNSS time.
`AbsoluteDate`	`getJ2000Epoch()`	J2000.0 Reference epoch: 2000-01-01T12:00:00 Terrestrial Time (not UTC).
`AbsoluteDate`	`getJavaEpoch()`	Java Reference epoch: 1970-01-01T00:00:00 Universal Time Coordinate.
`AbsoluteDate`	`getJulianEpoch()`	Reference epoch for julian dates: -4712-01-01T12:00:00 Terrestrial Time.
`AbsoluteDate`	`getModifiedJulianEpoch()`	Reference epoch for modified julian dates: 1858-11-17T00:00:00 Terrestrial Time.
`AbsoluteDate`	`getPastInfinity()`	Dummy date at infinity in the past direction.
`QZSSScale`	`getQZSS()`	Get the Quasi-Zenith Satellite System time scale.
`AbsoluteDate`	`getQzssEpoch()`	Reference epoch for QZSS weeks: 1980-01-06T00:00:00 QZSS time.
`TAIScale`	`getTAI()`	Get the International Atomic Time scale.
`TCBScale`	`getTCB()`	Get the Barycentric Coordinate Time scale.
`TCGScale`	`getTCG()`	Get the Geocentric Coordinate Time scale.
`TDBScale`	`getTDB()`	Get the Barycentric Dynamic Time scale.
`TTScale`	`getTT()`	Get the Terrestrial Time scale.
`UT1Scale`	`getUT1(IERSConventions conventions, boolean simpleEOP)`	Get the Universal Time 1 scale.
`UTCScale`	`getUTC()`	Get the Universal Time Coordinate scale.
`static TimeScales`	`of(Collection<? extends OffsetModel> utcMinusTai, BiFunction<? super IERSConventions,? super TimeScales,? extends Collection<? extends EOPEntry>> eopSupplier)`	Create a set of time scales where all the data is loaded from the given functions.

- Method Detail
  - getTAI
```
TAIScale getTAI()
```
    Get the International Atomic Time scale.
    
    Returns:
    
    International Atomic Time scale
  - getUTC
```
UTCScale getUTC()
```
    Get the Universal Time Coordinate scale.
    
    Returns:
    
    Universal Time Coordinate scale
  - getUT1
```
UT1Scale getUT1(IERSConventions conventions,
                boolean simpleEOP)
```
    Get the Universal Time 1 scale.
    
    Parameters:
    
    conventions - IERS conventions for which EOP parameters will provide dUT1
    
    simpleEOP - if true, tidal effects are ignored when interpolating EOP
    
    Returns:
    
    Universal Time 1 scale
    
    See Also:
    
    getUTC(), Frames.getEOPHistory(IERSConventions, boolean)
  - getTT
```
TTScale getTT()
```
    Get the Terrestrial Time scale.
    
    Returns:
    
    Terrestrial Time scale
  - getGST
```
GalileoScale getGST()
```
    Get the Galileo System Time scale.
    
    Returns:
    
    Galileo System Time scale
  - getGLONASS
```
GLONASSScale getGLONASS()
```
    Get the GLObal NAvigation Satellite System time scale.
    
    Returns:
    
    GLObal NAvigation Satellite System time scale
  - getQZSS
```
QZSSScale getQZSS()
```
    Get the Quasi-Zenith Satellite System time scale.
    
    Returns:
    
    Quasi-Zenith Satellite System time scale
  - getGPS
```
GPSScale getGPS()
```
    Get the Global Positioning System scale.
    
    Returns:
    
    Global Positioning System scale
  - getTCG
```
TCGScale getTCG()
```
    Get the Geocentric Coordinate Time scale.
    
    Returns:
    
    Geocentric Coordinate Time scale
  - getTDB
```
TDBScale getTDB()
```
    Get the Barycentric Dynamic Time scale.
    
    Returns:
    
    Barycentric Dynamic Time scale
  - getTCB
```
TCBScale getTCB()
```
    Get the Barycentric Coordinate Time scale.
    
    Returns:
    
    Barycentric Coordinate Time scale
  - getGMST
```
GMSTScale getGMST(IERSConventions conventions,
                  boolean simpleEOP)
```
    Get the Greenwich Mean Sidereal Time scale.
    
    Parameters:
    
    conventions - IERS conventions for which EOP parameters will provide dUT1
    
    simpleEOP - if true, tidal effects are ignored when interpolating EOP
    
    Returns:
    
    Greenwich Mean Sidereal Time scale
    
    Since:
    
    7.0
  - getIRNSS
```
IRNSSScale getIRNSS()
```
    Get the Indian Regional Navigation Satellite System time scale.
    
    Returns:
    
    Indian Regional Navigation Satellite System time scale
  - getBDT
```
BDTScale getBDT()
```
    Get the BeiDou Navigation Satellite System time scale.
    
    Returns:
    
    BeiDou Navigation Satellite System time scale
  - getJulianEpoch
```
AbsoluteDate getJulianEpoch()
```
    Reference epoch for julian dates: -4712-01-01T12:00:00 Terrestrial Time.
    Both java.util.Date and DateComponents classes follow the astronomical conventions and consider a year 0 between years -1 and +1, hence this reference date lies in year -4712 and not in year -4713 as can be seen in other documents or programs that obey a different convention (for example the convcal utility).
    
    Returns:
    
    Julian epoch.
  - getModifiedJulianEpoch
```
AbsoluteDate getModifiedJulianEpoch()
```
    Reference epoch for modified julian dates: 1858-11-17T00:00:00 Terrestrial Time.
    
    Returns:
    
    Modified Julian Epoch
  - getFiftiesEpoch
```
AbsoluteDate getFiftiesEpoch()
```
    Reference epoch for 1950 dates: 1950-01-01T00:00:00 Terrestrial Time.
    
    Returns:
    
    Fifties Epoch
  - getCcsdsEpoch
```
AbsoluteDate getCcsdsEpoch()
```
    Reference epoch for CCSDS Time Code Format (CCSDS 301.0-B-4): 1958-01-01T00:00:00 International Atomic Time (not UTC).
    
    Returns:
    
    CCSDS Epoch
  - getGalileoEpoch
```
AbsoluteDate getGalileoEpoch()
```
    Reference epoch for Galileo System Time: 1999-08-22T00:00:00 GST.
    
    Returns:
    
    Galileo Epoch
  - getGpsEpoch
```
AbsoluteDate getGpsEpoch()
```
    Reference epoch for GPS weeks: 1980-01-06T00:00:00 GPS time.
    
    Returns:
    
    GPS Epoch
  - getQzssEpoch
```
AbsoluteDate getQzssEpoch()
```
    Reference epoch for QZSS weeks: 1980-01-06T00:00:00 QZSS time.
    
    Returns:
    
    QZSS Epoch
  - getIrnssEpoch
```
AbsoluteDate getIrnssEpoch()
```
    Reference epoch for IRNSS weeks: 1999-08-22T00:00:00 IRNSS time.
    
    Returns:
    
    IRNSS Epoch
  - getBeidouEpoch
```
AbsoluteDate getBeidouEpoch()
```
    Reference epoch for BeiDou weeks: 2006-01-01T00:00:00 UTC.
    
    Returns:
    
    Beidou Epoch
  - getGlonassEpoch
```
AbsoluteDate getGlonassEpoch()
```
    Reference epoch for GLONASS four-year interval number: 1996-01-01T00:00:00 GLONASS time.
    By convention, TGLONASS = UTC + 3 hours.
    
    Returns:
    
    GLONASS Epoch
  - getJ2000Epoch
```
AbsoluteDate getJ2000Epoch()
```
    J2000.0 Reference epoch: 2000-01-01T12:00:00 Terrestrial Time (not UTC).
    
    Returns:
    
    J2000 Epoch
    
    See Also:
    
    AbsoluteDate.createJulianEpoch(double), AbsoluteDate.createBesselianEpoch(double)
  - getJavaEpoch
```
AbsoluteDate getJavaEpoch()
```
    Java Reference epoch: 1970-01-01T00:00:00 Universal Time Coordinate.
    Between 1968-02-01 and 1972-01-01, UTC-TAI = 4.213 170 0s + (MJD - 39 126) x 0.002 592s. As on 1970-01-01 MJD = 40587, UTC-TAI = 8.000082s
    
    Returns:
    
    Java Epoch
  - getPastInfinity
```
AbsoluteDate getPastInfinity()
```
    Dummy date at infinity in the past direction.
    
    Returns:
    
    the earliest date.
  - getFutureInfinity
```
AbsoluteDate getFutureInfinity()
```
    Dummy date at infinity in the future direction.
    
    Returns:
    
    the latest date.
  - createJulianEpoch
```
AbsoluteDate createJulianEpoch(double julianEpoch)
```
    Build an instance corresponding to a Julian Epoch (JE).
    According to Lieske paper: Precession Matrix Based on IAU (1976) System of Astronomical Constants, Astronomy and Astrophysics, vol. 73, no. 3, Mar. 1979, p. 282-284, Julian Epoch is related to Julian Ephemeris Date as:
    
    JE = 2000.0 + (JED - 2451545.0) / 365.25
    
    This method reverts the formula above and computes an AbsoluteDate from the Julian Epoch.
    Parameters:
    
    julianEpoch - Julian epoch, like 2000.0 for defining the classical reference J2000.0
    
    Returns:
    
    a new instant
    
    See Also:
    
    getJ2000Epoch(), createBesselianEpoch(double)
  - createBesselianEpoch
```
AbsoluteDate createBesselianEpoch(double besselianEpoch)
```
    Build an instance corresponding to a Besselian Epoch (BE).
    According to Lieske paper: Precession Matrix Based on IAU (1976) System of Astronomical Constants, Astronomy and Astrophysics, vol. 73, no. 3, Mar. 1979, p. 282-284, Besselian Epoch is related to Julian Ephemeris Date as:
    
    BE = 1900.0 + (JED - 2415020.31352) / 365.242198781
    
    This method reverts the formula above and computes an AbsoluteDate from the Besselian Epoch.
    Parameters:
    
    besselianEpoch - Besselian epoch, like 1950 for defining the classical reference B1950.0
    
    Returns:
    
    a new instant
    
    See Also:
    
    createJulianEpoch(double)
  - of
```
static TimeScales of(Collection<? extends OffsetModel> utcMinusTai,
                     BiFunction<? super IERSConventions,? super TimeScales,? extends Collection<? extends EOPEntry>> eopSupplier)
```
    Create a set of time scales where all the data is loaded from the given functions.
    
    Parameters:
    
    utcMinusTai - offsets used to compute UTC. If the pre-1972 linear offsets are missing they will be added.
    
    eopSupplier - function to retrieve the EOP data. Since the EOP have to be reloaded every time a different IERSConventions is requested this function may be called multiple times. The requested conventions and the created time scales are passed as arguments. Attempting to call getUT1(IERSConventions, boolean) or getGMST(IERSConventions, boolean) on the time scales argument may result in unbounded recursion. To ignore EOP corrections this function should return an empty collection.
    
    Returns:
    
    a set of time scales based on the given data.
    
    See Also:
    
    UTCTAIOffsetsLoader.Parser, EopHistoryLoader.Parser

Interface TimeScales

Method Summary

Method Detail

getTAI

getUTC

getUT1

getTT

getGST

getGLONASS

getQZSS

getGPS

getTCG

getTDB

getTCB

getGMST

getIRNSS

getBDT

getJulianEpoch

getModifiedJulianEpoch

getFiftiesEpoch

getCcsdsEpoch

getGalileoEpoch

getGpsEpoch

getQzssEpoch

getIrnssEpoch

getBeidouEpoch

getGlonassEpoch

getJ2000Epoch

getJavaEpoch

getPastInfinity

getFutureInfinity

createJulianEpoch

createBesselianEpoch

of