As I've been finding! Sure beats a 22,000 year precession cycle to see the movement of the crossover points...
I understand the N/S terminal standstills along the "lunalemma", but since the path over one month doesn't close, there would have to be either an E/W (Deasil/Widdershins?) sinusoidal cycle, or a full circular path, either one returning after approximately a year. I haven't gotten my head around that question yet. Dave Sent from my iPad > On May 30, 2014, at 9:55 PM, "Roger Bailey" <[email protected]> wrote: > > 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: <[email protected]> > 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" <[email protected]> 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 >> --------------------------------------------------- >> https://lists.uni-koeln.de/mailman/listinfo/sundial >> > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2014.0.4592 / Virus Database: 3950/7577 - Release Date: 05/28/14 > > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2014.0.4592 / Virus Database: 3955/7594 - Release Date: 05/30/14
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