﻿Wobble Method
Corrects a vector in the ITRF (rotating Earth-fixed system) for polar motion, and also corrects the longitude origin (by a tiny amount) to the Terrestrial Intermediate Origin (TIO).

Namespace: ASCOM.Astrometry.NOVAS
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.1.1.2619)

# Syntax

C#
```public void Wobble(
double Tjd,
TransformationDirection Direction,
double xp,
double yp,
double[] Pos1,
ref double[] Pos2
)```
Visual Basic
```Public Sub Wobble ( _
Tjd As Double, _
Direction As TransformationDirection, _
xp As Double, _
yp As Double, _
Pos1 As Double(), _
ByRef Pos2 As Double() _
)```
Visual C++
```public:
virtual void Wobble(
double Tjd,
TransformationDirection Direction,
double xp,
double yp,
array<double>^ Pos1,
array<double>^% Pos2
) sealed```

#### Parameters

Tjd
Type: System..::..Double
TT or UT1 Julian date.
Direction
Type: ASCOM.Astrometry..::..TransformationDirection
Flag determining 'direction' of transformation; direction = 0 transformation applied, ITRS to terrestrial intermediate system direction != 0 inverse transformation applied, terrestrial intermediate system to ITRS
xp
Type: System..::..Double
Conventionally-defined X coordinate of Celestial Intermediate Pole with respect to ITRF pole, in arcseconds.
yp
Type: System..::..Double
Conventionally-defined Y coordinate of Celestial Intermediate Pole with respect to ITRF pole, in arcseconds.
Pos1
Type: array<System..::..Double>[]()[][]
Position vector, geocentric equatorial rectangular coordinates, referred to ITRF axes.
Pos2
Type: array<System..::..Double>[]()[][]%
Position vector, geocentric equatorial rectangular coordinates, referred to true equator and TIO.