It wasn't until a little after midnight when cirrus started moving over
the observatory. Until then, the sky was photometric and the seeing was
1.5-2 arcsec. The cirrus lasted for about 3 hours and some time was lost
when thicker patches of the stuff got in the way. The seeing was degraded a
bit after the cirrus left the sky and for the last 1-2 hours of the night,
it was 2-2.5 arcsec. In all, nearly 20
blazars were successfully observed for polarization, though photometry of
several of these could not be obtained because of the clouds.