The Galilean space is a three dimensional complex projective space, P₃, in which the absolute figure {w ,f,I1, I2} consists of a real plane w (the absolute plane), a real line f ⊂ w (the absolute line) and two complex conjugate points, I1, I2∈f (the absolute points).
I suggest you to take a look at the following paper from http://www.emis.de/journals/BMAA/repository/docs/BMAA5_2_7.pdf