At the beginning of Prometheus movie, the two archaeologists Elizabeth Shaw and Charlie Holloway discover a "star map" among several unconnected ancient cultures.

That map will led the Prometheus expedition to [LV-223](http://avp.wikia.com/wiki/LV-223) (a moon of [Calpamos planet](http://avp.wikia.com/wiki/Calpamos) in [Zeta Reticuli binary star system](https://en.wikipedia.org/wiki/Zeta_Reticuli)), but how is this "star map" supposed to work? Many of those ancient cultures just painted 7-9 or so points in a wall, how can this point to a moon of a planet in a two star system at 40 light year from earth?