Ezechiel
Paranormal Adept
This is my interpretation of the biggest pictograph (triangle inside circle):
Triangle = 3
Circle = orbit
small black circle (top left) = earth
large black circle (bottom right) = sun
Ok, so the earth is the third planet orbiting around the sun.... we already knew that right ?
Or...
This could be the setup of their binary star system. A smaller star orbiting around a larger one. The orbit brings the smaller star fairly close to the larger one and the triangle is a unique signature describing the elliptical route of the smaller star.
http://www.jstor.org/pss/3606557
In other words, this thing says 'you can find us in a binary system fairly close to here' ..... and you've got 45 minutes to get the angles of this triangle right as they are the orbital signature that you'll need in order to find us
http://hyperion.cc.uregina.ca/~astro/Kepler_poly.html