Determine the constants A and B in the atmospheric refraction model dZ = A tan Z $+$ B tan$\ast$$\ast$3 Z. This is a fast alternative to the palRefco routine.

Z is the " observed" zenith distance (i.e. affected by refraction) and dZ is what to add to Z to give the " topocentric" (i.e. in vacuo) zenith distance.

palRefcoq( double tdk, double pmb, double rh, double wl, double $\ast$refa, double $\ast$refb );

tdk = double (Given)

pmb = double (Given)

rh = double (Given)

wl = double (Given)

refa = double $\ast$ (Returned)

refb = double $\ast$ (Returned)

• Uses eraRefco(). See SOFA/ERFA documentation for details.

• Note that the SOFA/ERFA routine uses different order of of arguments and uses deg C rather than K.