'How to understand the solar zenith angle from tle data using pyorbital

Recently, I started processing tle data using pyorbital python library. I would like to get the solar zenith angle using this function:

astronomy.sun_zenith_angle(utc_time, lon, lat)

In degrees, I get a number between 0° and 180°. I don't really understand this range, because if I understand well, the solar zenith angle is between -180° and 180°. I hope, you can help me!



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