SofaBpn2xy Method

Extract the CIP X,Y coordinates from a bias-precession-nutation matrix.

Definition

Namespace: ASCOM.Tools
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 3.0.0-rc.1+86c25ce733aebb4d8b1b8a62e84770ea5e972bea

C#

public static void Bpn2xy(
	double[] rbpn,
	ref double x,
	ref double y
)

VB

Public Shared Sub Bpn2xy ( 
	rbpn As Double(),
	ByRef x As Double,
	ByRef y As Double
)

Parameters

rbpn Double: Celestial-to-true rotation matrix (row-major, length 9).
x Double: Returned X coordinate of the Celestial Intermediate Pole (GCRS).
y Double: Returned Y coordinate of the Celestial Intermediate Pole (GCRS).

Remarks

The input matrix transforms vectors from GCRS to the true equator (and CIO/equinox) of date; the CIP unit vector is the bottom row of the matrix.

Exceptions

ArgumentNullException	Thrown if any array parameter is null.
ArgumentException	Thrown if any array parameter has incorrect length.

Version Information

.NET Standard

Supported in: 2.0