Returns the values for nutation in longitude and nutation in obliquity for a given TDB Julian date.

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

Syntax

C#
public void NutationAngles(
	double t,
	Accuracy Accuracy,
	ref double DPsi,
	ref double DEps
)
Visual Basic
Public Sub NutationAngles ( _
	t As Double, _
	Accuracy As Accuracy, _
	ByRef DPsi As Double, _
	ByRef DEps As Double _
)
Visual C++
public:
virtual void NutationAngles(
	double t, 
	Accuracy Accuracy, 
	double% DPsi, 
	double% DEps
) sealed

Parameters

t
Type: System..::..Double
TDB time in Julian centuries since J2000.0
Accuracy
Type: ASCOM.Astrometry..::..Accuracy
Selection for accuracy
DPsi
Type: System..::..Double%
Nutation in longitude in arcseconds.
DEps
Type: System..::..Double%
Nutation in obliquity in arcseconds.

Remarks

The nutation model selected depends upon the input value of 'Accuracy'. See notes below for important details.

This function selects the nutation model depending first upon the input value of 'Accuracy'. If 'Accuracy' = 0 (full accuracy), the IAU 2000A nutation model is used. If 'Accuracy' = 1 a specially truncated (and therefore faster) version of IAU 2000A, called 'NU2000K' is used.

See Also