1.5mRC Spectrograph rotation

The spectrograph is normally operated with its slit E-W. In principle the spectrograph can be rotated to any position angle. However, this operation is performed manually and requires bringing the telescope to the zenith and raising the observing floor. Consequently frequent changes of the position angle should be avoided, and ten to fifteen minutes of overhead time should be allowed for each such operation. It should be further noted that the leaky guider only functions if the spectrograph slit is close to the E-W or N-S directions.