Nearly everything in pvlib represents azimuth angles as values in [0, 360) clockwise from north, except pvlib.iotools.get_pvgis_hourly:

This inconsistency is a shame. However, I don't see any way to switch it to pvlib's convention without a hard break, which is also a shame. I wonder how others view the cost/benefit analysis here.

See also #1395 (comment)