===== ZU =====
==== MKII/MKIII/MKIV Automated Zenith Sky Measurement ====

ZU is an (infrequently conducted) variation of the ZS command in which the Azimuth Tracker is rotated to an angle perpendicular to the sun. Instrument setup is similar to ZP observations but also using Umkher wavelengths. 

See [[zs|ZS]].