The first light that passes through the 'oracle hole' hits an upright megalith that forms part of a partition at the back of the apse. The sunlight is projected on the stone in the form of a crescent shape.
The light that passes through the 'oracle hole' moves down along the ground until it becomes a long eliptical shape on the 'torba' floor.

To see an animation of the moving light, click on the beam of light in the photograph below.

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