ASCOM Library
SofaNut
Computes the nutation in longitude and obliquity for a given date using the IAU 2000A model.
Definition
Namespace: ASCOM.Tools
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 3.0.0-rc.1+86c25ce733aebb4d8b1b8a62e84770ea5e972bea
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 3.0.0-rc.1+86c25ce733aebb4d8b1b8a62e84770ea5e972bea
C#
public static void Nut00a(
double date1,
double date2,
ref double dpsi,
ref double deps
)VB
Public Shared Sub Nut00a (
date1 As Double,
date2 As Double,
ByRef dpsi As Double,
ByRef deps As Double
)Parameters
- date1 Double
- The first part of the Julian Date representing the date for which to calculate nutation. Typically the integer part.
- date2 Double
- The second part of the Julian Date representing the date for which to calculate nutation. Typically the fractional part.
- dpsi Double
- When this method returns, contains the nutation in longitude, in radians.
- deps Double
- When this method returns, contains the nutation in obliquity, in radians.
Remarks
This method is a P/Invoke wrapper for the SOFA library function 'iauNut00a', which implements the IAU
2000A nutation model. The date should be supplied as a two-part Julian Date to preserve precision. The results are
suitable for high-precision astronomical calculations.