Package org.orekit.time

Class TDBScale

java.lang.Object

org.orekit.time.TDBScale

All Implemented Interfaces:

TimeScale

public class TDBScale
extends Object
implements TimeScale

Barycentric Dynamic Time.

Time used to take account of time dilation when calculating orbits of planets, asteroids, comets and interplanetary spacecraft in the Solar system. It was based on a Dynamical time scale but was not well defined and not rigorously correct as a relativistic time scale. It was subsequently deprecated in favour of Barycentric Coordinate Time (TCB), but at the 2006 General Assembly of the International Astronomical Union TDB was rehabilitated by making it a specific fixed linear transformation of TCB.

By convention, TDB = TT + 0.001658 sin(g) + 0.000014 sin(2g)seconds where g = 357.53 + 0.9856003 (JD - 2451545) degrees.

Author:

Aude Privat

Method Summary

Modifier and Type	Method	Description
String	getName()	Get the name time scale.
TimeOffset	offsetFromTAI(AbsoluteDate date)	Get the offset to convert locations from TAIScale to instance.
<T extends CalculusFieldElement<T>> T	offsetFromTAI(FieldAbsoluteDate<T> date)	Get the offset to convert locations from TAIScale to instance.
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.time.TimeScale

getLeap, getLeap, insideLeap, insideLeap, minuteDuration, minuteDuration, offsetToTAI

Method Details

offsetFromTAI

public TimeOffset offsetFromTAI(AbsoluteDate date)

Get the offset to convert locations from TAIScale to instance.

Specified by:

offsetFromTAI in interface TimeScale

Parameters:

date - conversion date

Returns:

offset in seconds to add to a location in TAIScale time scale to get a location in instance time scale

See Also:

• TimeScale.offsetToTAI(DateComponents, TimeComponents)

offsetFromTAI

public <T extends CalculusFieldElement<T>> T offsetFromTAI(FieldAbsoluteDate<T> date)

Get the offset to convert locations from TAIScale to instance.

Specified by:

offsetFromTAI in interface TimeScale

Type Parameters:

T - type of the filed elements

Parameters:

date - conversion date

Returns:

offset in seconds to add to a location in TAIScale time scale to get a location in instance time scale

See Also:

• TimeScale.offsetToTAI(DateComponents, TimeComponents)

getName

public String getName()

Get the name time scale.

Specified by:

getName in interface TimeScale

Returns:

name of the time scale

toString

public String toString()

Overrides:

toString in class Object