NOVAS2.CelPole Method
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NOVAS2CelPole Method

This function allows for the specification of celestial pole offsets for high-precision applications.

Namespace:  ASCOM.Astrometry.NOVAS
Assembly:  ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: (
public static void CelPole(
	double del_dpsi,
	double del_deps


Type: SystemDouble
Value of offset in delta psi (dpsi) in arcseconds.
Type: SystemDouble
Value of offset in delta epsilon (deps) in arcseconds.
These are added to the nutation parameters delta psi and delta epsilon.

1. This function sets the values of global variables 'PSI_COR'and 'EPS_COR' declared at the top of file 'novas.c'. These global variables are used only in NOVAS function 'earthtilt'.

2. This function, if used, should be called before any other NOVAS functions for a given date. Values of the pole offsets specified via a call to this function will be used until explicitly changed.

3. Daily values of the offsets are published, for example, in IERS Bulletins A and B.

4. This function is the "C" version of Fortran NOVAS routine "celpol".

See Also