And I've never even seen Avebury - it's over-rated, if you ask me - but I recall we were arguing on this forum a long time ago about it and it seemed that there was a barrow or barrows on Waden Hill that framed the southernmost moon (was it rise or set?) from the southern entrance to the henge, and that this barrow, or barrows, had now been ploughed out. It was also now impossible to see this setting or rising position because of a clump of trees that now blocked the sightline - and anyway the lunar maxima are presently about sixteen years away, in the future ...