Hi David and all,
There are lunastices generally called lunar standstills. These occur every
month as opposed to every year for solstices. As the moons orbit is tilted
about 5° from the ecliptic, these lunastices are different from the solstices
and vary over an 18 year period from major to minor and back to major
standstill due to precession. Stonehenge and other ancient megaliths are
reported to be demonstrations of lunastices. The motions of the moon are very
interesting as such a short cycle, a month, and only 18 years in their
precession cycle. This opens up the topic of moon dials, specifically
declination dependant moon dials. Stay tuned as this lunacy unfolds at the NASS
conference this year.
Regards, Roger Bailey
From: David Bell
Sent: Friday, May 30, 2014 12:12 PM
To: Robert Terwilliger
Cc: sundial@uni-koeln.de
Subject: Re: Lunar Analemma
Great analemma (Lanalemma?) photo!
So, how does it continue, month by month? In a spiral fashion, then return over
the same area of the sky, after slowing to a halt? Are there lunastices,
then? If so, how do they correspond to the solstices!
Dave
Sent from my iPhone
On May 30, 2014, at 2:34 AM, Robert Terwilliger b...@twigsdigs.com wrote:
Earth Science Picture of the Day
http://epod.usra.edu/blog/2014/05/lunar-analemma.html
As part of my morning routine I take a look at a page I made with two
“Pictures of the Day” Astronomy and Earth Science. I made up another one so
anyone interested can take a look at them. Bookmark it.
http://www.twigsdigs.com/annex/picture/picture_od.html
It uses Iframes so scrolling takes some getting used to.
Bob
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