Richard Ozer wrote:
>
> This is somewhat off-topic; but it was observing related.
>
> Last night I dreamt that I was variable star observing with my 10" dob and was suddenly unable to see any 7th magnitude stars. I
> could see 4th, 5th and 6th magnitude just fine; and I had no trouble seeing 8th and 9th magnitude. But, all the 7th magnitude stars
> were GONE!
>
> I was really freaking out in my dream and I methodically came to the conclusion that it had something to do with the Windows XP
> laptop I was using as digital setting circles.
No. It was close to morning, and the sky was imperceptibly
brightening. The first visual effect is not that the sky looks bright,
but rather that the faintest stars disappear.
Clear Skies!
-- Jim Van Nuland, San Jose (California) Astronomical Association <a href="http://www.svpal.org/~jvn/ ">JVN's web site</a>