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I wonder what definition of sunrise and sunset they're using (first/last gleam; half-disk visible or full disk tangential to and above the horizon). Not that it makes a whole lot of difference, mind you.
The figure for the lozenge angle at 55N based on full disk tangential in the current era is 87° 50' 56", but back in 2500BC it was 90° 15' 42" so it's definitely been exactly 90° (according to any definition of sunrise/sunset) sometime in the last 4500 years.
At Stonehenge, the 2500BC lozenge angle was 80° 54' 56" but its present value is 78° 51' 43".
Shame we don't know (from the report) the angle of the lozenge found at Poulton.
Edit: Here's a closeup of the plaque - it's only a fragment, sadly. From The Poulton Project website
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simon
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