[vera-rubin]

solar_azimuth_analytical in pvlib 0.16.2.dev10+g49530b4dc returns 180° for latitude -35°, hour angle 0°, declination 0°, and zenith 35°; spherical geometry gives 0° (due north).

import numpy as np
from pvlib.solarposition import solar_azimuth_analytical
np.degrees(solar_azimuth_analytical(*np.radians([-35, 0, 0, 35])))
# Before: 180.0, expected: 0.0

We use the morning branch at zero hour angle to preserve the northward direction. We verified the regression fails before the fix and passes afterward, ran the solar-position test module, and checked independent spherical projections.

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