C99 API

Added

• Added novas_site_uvw() function to calculate geocentric interferometric projections for a site (an on_surface structure) around a line of sight (a.k.a. phase center).
• Added novas_uvw() function for more generalized calculations of interferometric projections.
• NOVAS C geo_posvel() is imprecise for Earth-based observers #306: Added novas_site_gcrs_posvel() for calculating more accurate GCRS position / velocity vectors for Earth-based observers.

Changed

• NOVAS C geo_posvel() is imprecise for Earth-based observers #306: novas_make_frame() now uses the new novas_site_gcrs_posvel() when calculating SSB-based observer position and velocity for Earth-based geodetic locations.
• eliminated unnecessary includes of <stdio.h>.

C++ API

Added

• Added Interferometric class to handle interferometric u, v, w projections and to supply geometric delays along the line of sight.
• Added Observer::to_interferometric() method to convert an observer location to an interferometric projection around an observed line of sight for the array reference location.
• Added AstrometricPosition::to_interferometric() method to convert a relative station position (w.r.t. the array reference) to an interferometric projection along a line-of-sight, with precision, such as for space-based interferometers located far from Earth.
• Added Scalar abstract base class for scalar quantities.
• Added SolarSystemSource::barycentric_at() to get geometric positions velocities w.r.t. the SSB.

Changed

• Migrated Vector::x(), y(), z() to Position and Velocity classes with scalar return values.
• Moved Weather::guess(Site&) to Site::average_weather(), for simplicity.
• Added optional accuracy argument to a few methods.
• EOP does not enforce dUT1 being under a seconds, in line with the plant to eliminate leap seconds in 2035.