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Talking of alignments, does anyone know of any software that can show the night sky in prehistoric times? I have HNSky, but it only goes back as far as 1751. Freeware or shareware solutions would be preferable since this is only a fairly casual interest.

Isn't Starrynight pro the thing? Don't know anything about it but I've an idea Pete G has it (see his Silbury comets pic on HA)

You could try Cybersky from

http://www.cybersky.com/

It's shareware but there are no nag screens, it's easy to use and doesn't overwhelm you with complex astronomical stuff (which suits me!) although the complex stuff is in there if you understand it and it'll do dates back to 4000BC from any location.

-Chris

I use Home Planet, which is freeware from http://www.fourmilab.ch/ (click on Windows Utilities). It goes back to 4712 BC and covers any location on earth. Note - read the help if you're using BC dates as historians and astronomers have different ideas about the year zero!