Subject: Longer nights at APO

From: elt@astro.Princeton.EDU

Submitted: Sat, 18 Sep 1999 20:51:12 -0400 (EDT)

Message number: 382 (previous: 381, next: 383 up: Index)

I am posting this excerpt from the 4Q1999 preliminary schedule notes
to make sure that it is not missed in that massive and routine
mailing.  See also apo35-general message #370.

Ed Turner

+++++


	IMPORTANT NOTE: Starting this quarter, scheduled telescope time
	runs from nautical to nautical (-12 deg) twilight rather than
	being bounded by the astronomical (-18 deg) twilights.  This adds
	approximately one hour of scheduled time per night.  In addition,
	the first and last scheduled program of the night is *assumed* by
	*default* to have use of the time between sunset or sunrise,
	respectively, and nautical twilight for either calibration or
	observing.  The first scheduled observer of the night should thus
	be available to commence operations at the time of APO sunset or
	should inform site staff in advance if the pre-nautical twilight
	time is not needed.  Likewise, site staff will inform the relevant
	observer as early as possible if engineering activities will
	pre-empt the telescope before/after nautical twilight, as will
	sometimes happen.  Neither institutions nor programs will be charged
	for the use of time between nautical twilight and sunset/sunrise,
	of course.  These changes in policy are intended to formalize what
	has become our de facto practise.


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