The Lowell Observatory 72" telescope dome in early twilight,
with Perseus and Cassiopea behind. The Perseus Double Cluster
is visible in the upper-right-center. Stars down to mag. 7.0
can be seen, even in twilight. Star trails are short because
the view is near the north celestial pole. I tweaked the brightness
of the lights in the dome several times to get a good balance between
internal and external light.

5:24 am, Sept. 24 2001.
60 seconds, f2.6, ISO 200
Subsampled 50%