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On 8/29/2015 2:32 PM, Don Seltzer wrote:
> But consider refraction, which extends the period for which both bodies
> are visible.
> In Boston this very evening, the full moon will rise at 7:16 pm and the
> sun will set 8 minutes later.

But is it a *full* moon, 100% illumination?

Regarding my thought of full moon and sun visible visible at very high
latitudes near summer solstice, that could not happen this year as the
full moon had a high southern declination, and north declination near
the southern hemisphere summer solstice. I did not see other NA daily
entries where both would be visible book ending of the solstice. Doesn't
mean they are not there, only that it was not readily apparent to me.

Is there a year during the moons 19-year cycle when the full moon will
have a large north declination near summer solstice (or the reverse for
down under)?

Being literal, Mark's question was, "P.S. can somebody please tell the
full moon to come out in the daytime this weekend, I want to try out my
new higher magnification prism scope on my lunar sun sights " Not "if"
or "when. " I believe this may have been tongue-in-cheek humor.

And why would one need a full moon for a sun lunar? If it did exist in
nature it could pose  problem, being fully illuminated for a brief
period of time in specific regions.  If not 100%, how do you tell the
near from the far limb unless it is decidedly before or after full?
Other than than knowing the exact 100% where and when, waxing or waning
is your only clue.

   

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