The video "Bethlehem Star" is the most complete, and moving study I have seen on this subject. I highly recommend it. Using modern technology and good old fashion detective work, this man has hit on something so simple, so basic that the layman can understand it (he's not a scientist, just a believer who went looking for answers).

http://www.youtube.com/watch?v=venqYheEqic

Blessings~

Suzi