The opening shot is a montage showing a band of nomads walking westward across a valley somewhere in the north Middle East, just after sunset and around 10000 BC. In the emerging night sky, the planets are shining clearly. From the horizon in the lower right to the top left they are as follows: Mercury, Venus, Mars, Jupiter and Saturn.
I don't know if the planets have ever been aligned like this in our sky, perfectly according their order of distance from the Sun, probably not but I figured it was a nice way to start the film. The wanderers of the earth under the wanderers of the sky.