Kipp&Zonen POM-02 Sky Radiometer - Manual (Page 11)

4. Scattering direction Skyradiometer steps clockwise (morning) and counterclockwise (afternoon)
while sun altitude is below 75deg.
Skyradiometer steps to zenith direction while sun altitude is over 75deg.
Scattering angle Max 24 point (depending on sun altitude)
0,2,3,4,5,7,10,15,20,25,30,40,50,60,70,80,90,100,110,120,130,140,150,160
Azimuth measurement
clockwise
counterclockwise
Zenith measurement