During the summer observational season, the sun clears the top of Stone C, as seen from Stone A, near the middle. As page 31 of the Guidebook shows, the sun is at the exact center on summer solstice day, 6/21. That is as far north, i.e., to the left, as it can go.
The three photos above were taken by Chika-san on May 23 from 8:25 to 8:26 am. The sun on that day appeared slightly to the right of center because there are still around 29 days to go before summer solstice.