> " the Romans were aware that there are 12--13 lunar cycles in each
> solar year."
> Is there a link with the white stones of Newgrange which may have
> covered that mound?
When the mound was excavated, a percentage of the stones were quartz from
Wicklow area. It was decided to place these on the outside when reconstructing
the mound after excavation, but they were scattered amongst the rest of the
stones when the site was excavated.