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Hey, Sol,
well I posted in Cloudy Nights but it didn't generate much interest. There was one guy who had generated quite impressive results by simply phase matching and using the librations to get a different view.
In answer to your question, you can use any separation you like, longitude, latitude or a mix of the two, but the orientation determines the orientation of the final image. Let me explain.
So you take a nice shot of the terminator at, say first quarter. It's a typical shot with the terminator running vertically through the image.
Simultaneously, your friend at the same longitude in the northern hemisphere takes the same shot.
When you put them together, they will look weird and hurt the eyes. The reason is because the baseline in the photo - the separation between the eyes - runs vertically not horizontally. When you look at the image, the pictures you are seeing are exactly as if your eyes have been reconfigured in your face so that one is directly above the other. It's a very strange feeling and our brains are not equipped to deal with it.
The solution to this Picasso-isation or the senses? Turn the picture 90 degrees. One way will invert the 3D, the other will give you the correct 3D. A lot of 3D systems can't deal with tilting of the head. If you have anaglyph glasses, try it.
Anyway, you end up with a first quarter image that has its terminator in the horizontal plane with the limb hanging above or below, and no other orientation will work because it is 'baked in' by the angle between the two observers. Correctly gauging the direction of the baseline in the images is one of the most important steps in post.
Hope that helps!
Cheers
Markus
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