The south entrance to Avebury henge was defined by a pair of enormous monoliths - Stones 1 and 98. Celebrants/pilgrims/worshippers just about to enter the henge could have looked up to their left and seen this "block face" sculpture on Stone 1.

This face is very similar to zenith seekers I have already photographed here and here. However, this Stone 1 face is different as it is is not oriented to the zenith, but upwards as if looking at an easterly celestial object which is already fairly high in the sky. In other words this sculpture is not concerned with the moment of solar/lunar/stellar dawn but an easterly event in the sky that took place appreciably later in the morning/night.