Before I visited Callanish, I had known only that the moon waxes and wanes every 29 1/2 days, rising and setting about fifty minutes later each day.
(I; visited; Callanish) (I; had known only; that the moon waxes and wanes every 29 1/2 days; T:Before I visited Callanish) Context(I had known only,List([28, 44))):(the moon; waxes; )
I had known only,List([28, 44))
I I the moon
visited had known only waxes
Callanish
that the moon waxes and wanes every 29 1/2 days T:Before I visited Callanish