The locations are taken from the southern hemispheres. Their exact degree below the equator is irrelevant because the point is not where at in the sky the constellations rest relevant to each other; the point is that you can see the same constellations at all. I would love for you to check out the accuracy of the program on your own computer. My cpu was acting funny as I was looking at the pictures. It took a long time to finally get them right, but I'm certain they are accurate and represent the skies from the different locations at the same julian date and roughly the exact same zulu time, give or take a couple minutes.