I think we can see two bent fingers, one from the ground and one from the sky ('Earth and Sky'). These fingers end in nails. These nails look like the sun. We can compare with the hands of 'September Sun'. In the hands of the 'September Sun' we have, I believe, half-years. Three fingers for three solar double-months and thumb for the whole half-year, but also as a sign of equinox, like - I guess - in GD43.

The two bent fingers above, like twins, presumably illustrate that what is above is also below, that sky and earth are mirror images of each other. Not only do the gods look like human beings (and behave that way), but also the temple builders take care to map on the ground what they see in the sky.

If we see a 'mountain' in the sky with apex at the celestial north pole, then we build a 'mountain' of earth at a place with similar characteristics, i.e. where our earthly ruler has his seat. The immovable point around which everything turns.