FreeLists / az-observing / [AZ-Observing] Re: SQM and crescent Moon

[ketelsen@xxxxxxxxxxxxxx]

Hi Brian-

Interesting data!  I recently ran across some data regarding crescent moon
brightnesses.  Because of the maria layout on the moon, the
identically-lit young crescent is brighter than the old crescent by a
factor of 2, as I recall.  Any anecdotal info along those lines and how it
would affect this experiment?

-Dean


>      For about 20 years I've used the rule-of-thumb that if the Moon
> is less than 15 percent illuminated there was no significant effect
> for visual deep-sky viewing.  Last night at Anderson Mesa I had the
> opportunity to make some SQM measurements of the effect of the late-rising
> Moon, which was 14 percent illuminated.  Here's the run of values taken
> hourly dusk-to-dawn (almost):
>

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