The last of the clouds that ended the previous night's observations took
the first couple of hours to clear out of the area. Observations were slowed a little and some planned photometry had to be abandoned early in the night.
After that, the sky was photometric and the seeing was excellent all night
long. It was never worse than about 1.5 arcsec and for long stretches, the
seeing was around 1 arcsec or better. An exceptional night.