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Centaur
2018-Aug-16, 04:10 PM
The Lunar X may be seen by telescopic observers in Europe and the Americas during Saturday 2018 AUG 18 for an approximately four-hour period centered on 14:52 CDT (19:52 UT). This will be an evening event in Europe and an afternoon event in the Americas. The X should appear as the Sun rises on the clustered rims of the craters Blanchinus, La Caille and Purbach, while a waxing Half Moon graces the sky.

This is something to check-off from your astronomical “to-do” list. Photos and descriptions of the Lunar X would be welcome additions to this thread.

My timetable for when the lunar terminator will be crossing select lunar features such as the Lunar X and rayed craters can be found at https://www.CurtRenz.com/moon.html

Roger E. Moore
2018-Aug-16, 06:09 PM
I seem to recall this has a history since the mid-20th century at least, with photos of the X and claims it was an alien moon base. Will look for references.

Meanwhile...

https://en.wikipedia.org/wiki/Lunar_X

http://wasociety.us/Lunar-X.pdf

Last pdf is very good.

Roger E. Moore
2018-Aug-16, 06:25 PM
A little more. I recall a "UFOs are real" book from the 1960s or so with a photo of the X.

http://www.astronomy.com/magazine/stephen-omeara/2010/05/stephen-james-omearas-secret-sky-oneills-illusion ...oops, this one is about the "bridge on the Moon," a similar phenomenon.

http://earthsky.org/astronomy-essentials/what-is-lunar-x

https://apod.nasa.gov/apod/ap180301.html

https://www.farmersalmanac.com/what-is-lunar-x-23985
https://www.universetoday.com/100810/stalking-the-lunar-x/
history

Roger E. Moore
2018-Aug-16, 06:44 PM
Found an old reference to it, "The Cross on the Moon":

http://www.astrosurf.com/lunascan/lune.htm

I have a copy of Frank Edwards's "Flying Saucers: Serious Business" and will check it there. [[LATER: CANNOT FIND THE BOOK!]] So the cross was seen and known well before 1974.



LATER: another reference to Edwards's book from Google Books.

https://books.google.com/books?id=XRQ_tgEACAAJ&dq=flying+saucers+serious+business&focus=searchwithinvolume&q=cross+moon

Does not show photograph, which was on page 221. Anyone else able to find this?


EVEN LATER--VICTORY:

yaaay! Found "The Curtiss Cross" as it was named in 2006. I guess it was the "Cross on the Moon" before then.

https://www.cloudynights.com/topic/70669-curtiss-cross-july-19-2006/
http://astroguyz.com/2011/09/19/astro-challenge-hunting-the-curtiss-cross/

"Curtiss Cross"

Someone should update Wikipedia on this. They don't keep my changes.

Roger E. Moore
2018-Aug-16, 07:54 PM
Two similar "illusions" often reported on the Moon: O'Neill's Bridge and Larrieu’s Dam

http://www.amateurastronomy.co.uk/cody/docs/Two%20strange%20formations%20on%20the%20Moon.pdf

Centaur
2018-Aug-16, 09:04 PM
Thanks for sharing your research, Roger. It's appalling that so many people consider intelligent extraterrestrials to be the default explanation for the unusual or mysterious. In the past they credited invisible deities.

Roger E. Moore
2018-Aug-17, 12:24 AM
I was born in 1955, and UFOs were the default explanation for everything in my childhood. Or communists. Whatever.

Roger E. Moore
2018-Aug-17, 01:21 AM
A random assortment of references for O'Neill's Bridge. Some links are through the Wayback Machine because the original websites are gone.


http://articles.adsabs.harvard.edu/full/1957BAICz...8...33S/0000033.000.html
"On the So-Called "Lunar Bridge", by J. Sadil, Public Observatory, Prague
Bulletin of the Astronomical Institutes of Czechoslovakia, vol. 8, p.33

https://www.youtube.com/watch?v=XmeTM6M7tlg
O'Neill's Bridge on the Moon - Introduction and Flyover (video)

http://www.astronomy.com/magazine/stephen-omeara/2010/05/stephen-james-omearas-secret-sky-oneills-illusion
Stephen James O'Meara's Secret Sky: O'Neill's illusion? The search continues for a feature on the Moon that may or may not be there.
By Stephen James O'Meara, Astronomy Magazine, July 2010

Stranger than Science, by Frank Edwards (1959) chapter 63

http://andrewplanck.com/unusual-feature-on-the-moon/
An Unusual Feature on the #Moon: O’Neill’s Bridge, by Andrew Planck

http://arnett.us.com/photo/ap/onb/onb.html
O'Neill's Bridge

https://xefer.com/2010/09/lunar-land-bridge
Lunar Land Bridge

http://astroguyz.com/2010/10/25/astro-challenge-spotting-oÕneillÕs-bridge/
Astro-Challenge: Spotting O’Neill’s Bridge.
October 25, 2010 By David Dickinson

https://groups.google.com/forum/#!topic/sci.space.history/QPxdbNJBYQE
O'Neill's bridge

https://www.astronomerswithoutborders.org/docs/19Eratosthenes-20ONeillsBridge.pdf

https://web.archive.org/web/20100531190300/http://the-moon.wikispaces.com:80/Promontorium+Olivium#Additional
Promontorium Olivium

https://web.archive.org/web/20100506024141/http://lpod.wikispaces.com:80/May+3,+2010
WILKINS AND THE BRIDGE, May 3, 2010

T. Dobbins and R. Baum (1998) O'Neill's Bridge Remembered. Sky and Telescope 95/1, 105-108.

https://en.wikipedia.org/wiki/John_Joseph_O%27Neill_(journalist)
John Joseph O'Neill (journalist)

https://books.google.com/books?id=gOW2MO-IFa4C&pg=PA36&lpg=PA36&dq=o'neill's+bridge&source=bl&ots=YEcU35F8dm&sig=fV8jSKhXS7k7uECrt4EHCM7buCQ&hl=en&sa=X&ved=2ahUKEwjmmND49PLcAhVNZawKHcYmCIA4FBDoATACegQIC BAB#v=onepage&q=o'neill's%20bridge&f=false
https://books.google.com/books?id=gOW2MO-IFa4C&pg=PA36&dq=Bridge#v=onepage&q=Bridge&f=false
Chu A.; Paech W.; Weigand M. (2012). "2a - Mare Crisium". The Cambridge Photographic Moon Atlas. Cambridge University Press. p. 36. doi:10.1017/CBO9781139095709.006. ISBN 9781107019737.

https://books.google.com/books?id=_6GNBwAAQBAJ&pg=PA331&lpg=PA331&dq=o'neill's+bridge&source=bl&ots=wbLbNqKshI&sig=dxRp4Aup482lscWxRk1Egu2Q7fM&hl=en&sa=X&ved=2ahUKEwjmmND49PLcAhVNZawKHcYmCIA4FBDoATAAegQIC hAB#v=onepage&q=o'neill's%20bridge&f=false
Return to the Far Side of Planet Moore! By Martin Mobberley (2015)

https://www2.lpod.org/wiki/May_19,_2018
May 19, 2018: Fallen Bridge

Roger E. Moore
2018-Aug-17, 01:44 AM
References on Larrieu's Dam, again some from WayBack Machine


http://adsabs.harvard.edu/full/2008JBAA..118...87L
Title: 'Larrieu's Dam'; the 'rediscovery' of a seldom explored topographical lunar feature in the foothills of the Rupes Altai
Authors: Longshaw, N.
Journal: Journal of the British Astronomical Association, vol.118, no.2, p.87-90

https://web.archive.org/web/20180530155342/https://the-moon.wikispaces.com/Polybius
Polybius [crater]
Larrieu's Dam - A curious formation at Polybius K, near the Rupes Altai, is unofficially called Larrieu's Dam. It was discovered in 1955 by A.C.Larrieu at Marseilles, France (see Bibliography below).

https://britastro.org/node/10481
Rupes Altai (Altai Scarp), British Astronomical Association

https://www.thefreelibrary.com/A+lunar+curiosity%3A+the+author+serendipitously+re discovers+Larrieu%27s+...-a0331082074
A lunar curiosity: the author serendipitously rediscovers Larrieu's Dam

Roger E. Moore
2018-Aug-17, 02:07 AM
https://web.archive.org/web/20170825085006/http://ltvt.wikispaces.com:80/curtiss+cross

Just found this on the Wayback Machine: The Curtiss Cross in high detail

Roger E. Moore
2018-Aug-17, 12:15 PM
And a last two, one from the WayBack Machine:


https://www.cloudynights.com/topic/35419-observation-and-photography-of-oneills-bridge/
Observation and photography of O'Neill's Bridge

https://web.archive.org/web/20150326024128/https://the-moon.wikispaces.com/O'Neill's+Bridge
WayBack Machine: O'Neill's Bridge

Roger E. Moore
2018-Aug-20, 12:26 PM
Has anyone tried looking for one of these phenomena? Any luck getting a photo or drawing of it?

Roger E. Moore
2018-Aug-22, 02:13 PM
While we can't see it from Earth, there is of course a natural bridge on the Moon, in photos snapped by the Lunar Reconnaissance Orbiter.

https://web.archive.org/web/20170624030534/https://www.nasa.gov/mission_pages/LRO/multimedia/lroimages/lroc-20100908-natural-bridge.html
Lunar Reconnaissance Orbiter: Natural Bridge on the Moon (2010)

https://airandspace.si.edu/multimedia-gallery/11830hjpg
Natural Bridge on the Moon


Would still love to see images of Lunar X (Curtis Cross, Cross on the Moon), Lunar V, O'Neill's Bridge, or other illusory/peculiar phenomena seen through telescopes on the Moon. Better still, instructions for viewing them at the best possible times.