[AZ-Observing] Re: Summer Twilight
- From: Brian Skiff <bas@xxxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Wed, 18 Jun 2014 14:51:08 -0700
I think you do get the zodiacal light somewhat
in the morning now, since it's in the north and
away from the galactic plane. But I also
recall a talk by Dan Duriscoe (National Park
Service doyen of the sky-brightness/light-pollution
efforts) where he showed an all-sky video taken
overnight about this time of year from USNO-Flagstaff.
He specifically highlighted the fact that the
morning twilight was evident well before
the usual -18 deg start of astronomical twilight.
The original Minnaert book has an extended
description of the progress of the night sky.
I agree with Tom that probably most of what
one sees near the solstice in the north is the
airglow and not twilight per se. But also with
Paul K that the morning seems to get bright in
the northeast quite early, I think mainly from
the zodiacal light.
\Brian
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