I remember seeing the 1957 Hollywood version of Omar Khayyam. It is entertaining in the way of the early Hollywood. There is a mention of astrolabe once in the film and that already elevated the film :)
But now there is also a new BBC documentary Omar Khayyam. Part 1 (10 minutes) is below, and you can find part 2, part 3, part 4, and part 5.