SofaApco Method

public static void Apco(
	double date1,
	double date2,
	double[] ebpv,
	double[] ehp,
	double x,
	double y,
	double s,
	double theta,
	double elong,
	double phi,
	double hm,
	double xp,
	double yp,
	double sp,
	double refa,
	double refb,
	ref SofaAstrom astrom
)

Public Shared Sub Apco ( 
	date1 As Double,
	date2 As Double,
	ebpv As Double(),
	ehp As Double(),
	x As Double,
	y As Double,
	s As Double,
	theta As Double,
	elong As Double,
	phi As Double,
	hm As Double,
	xp As Double,
	yp As Double,
	sp As Double,
	refa As Double,
	refb As Double,
	ByRef astrom As SofaAstrom
)

Parameters

date1  Double

TDB as a 2-part Julian Date (part 1).

date2  Double

TDB as a 2-part Julian Date (part 2).

ebpv  Double

Earth barycentric position/velocity (length 6).

ehp  Double

Earth heliocentric position (length 3).

x  Double

CIP X coordinate.

y  Double

CIP Y coordinate.

s  Double

CIO locator s.

theta  Double

Earth rotation angle (radians).

elong  Double

Observer longitude (radians, east positive).

phi  Double

Observer geodetic latitude (radians).

hm  Double

Observer height above ellipsoid (m).

xp  Double

Polar motion X (radians).

yp  Double

Polar motion Y (radians).

sp  Double

TIO locator s' (radians).

refa  Double

Refraction constant A.

refb  Double

Refraction constant B.

astrom  SofaAstrom

Returned astrometry parameters.

Reference