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PAL Library
The Starlink Positional Astronomy Library (PAL) is a C implementation of the SLALIB API. It is distributed under the GPL and uses the SOFA library wherever possible. V0.3.0 Add refraction code and support palOap and palAop. For closer compatibility with SLA for testing purposes the refraction routines internally use clones of slaNutc, slaEqeqx, slaGmst and slaGeoc. Once the code has been verified further the PAL/SOFA routines will be used instead. Switching routines seems to change the results in palTest by about 0.05 arcsec. V0.2.0 Improve configure script when not in a Starlink build environment. Use ./configure --prefix=/path/to/install when Starlink is not available and add --without-starlink if Starlink is present but should not be used. V0.1.5 Explcitly look for libm rather than relying on SOFA to pull it in. V0.1.4 Check for isblank() function and fall back if it is missing. V0.1.3 Improve copysign() detection. V0.1.2 Check for copysign() c99 function and fall back if it is missing. V0.1.1 The palDrange function has been modified so that it now returns +PI if the supplied angle is +PI (previously, it returned -PI in these cases). V0.1.0 Initial release with sufficient SLALIB API for AST and the Astro::Coords perl module. |