No problem, Ed! ------------------------------ On Tue, Mar 5, 2013 7:05 AM MST Ed wrote:

Joe,

Please accept my apology for that comment. I clearly misunderstood the technique you were describing as well as Patrick's intent with the moon parallax images.

Ed Stimpson -------------------------------- Quoting Joe Bauman <josephmbauman@yahoo.com>:

...

Ed, I'm a little surprised about the comment aimed at me -- I know very well there's a stereo-viewing technique that uses crossed eyes. The free-viewing stereo technique I use is the opposite, with the pairs merging when eyes are more uncrossed than normal. Also, I think there is a bit of a misunderstanding here. Patrick was talking about simultaneous views, not a comparison of the moon at different stages of libration. -- Joe

________________________________ From: Ed <utnatsedj1@xmission.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Saturday, March 2, 2013 11:46 AM Subject: Re: [Utah-astronomy] Moon parallax (and stereo) follow up

Patrick,

In no way am I trying to belittle your work in demonstrating the parallax of the Moon against the star field background with the cooperation of the fellow in Hawaii, and also producing a stereo pair of the Moon. Since I am particularly interested in stereo images, Moon included, I did some research to see if it hadn't already been done.

As mentioned in my last post, an obvious way to get a stereo pair of the Moon was to use images from its libration cycle. I was surprised to learn how long ago that had been done - in 1859! And, by the man who invented the light bulb, no less!

This site shows stereo pairs of the full Moon from the earliest by Warren de la Rue in 1858/59 using the wet-plate collodion process to a Lunar eclipse stereo pair spanning 5 years by Tom Matheson.

This site also has a .gif movie showing libration and the apparent size changes of the Moon from October 11 thru November 8, 2007.

http://lcni.uoregon.edu/~dow/Marks_photos/stereo_pairs/Apollo_moon/Stereo_pa...

I'm sure there are many more stereo images of the Moon out there for those interested in looking further.

And, Joe, you can cross your eyes to see stereo. Really. Yes you can!

Enjoy,

Ed Stimpson

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