The rare celestial combination first involved the convergence of a spring tide and a perigean tide
The lack of moonlight to illuminate the berg would have dominated, but the perigean tides
could then have been included as one exacerbating event.
Overlapping of the cycles of spring and perigean tides every 206 days results in an annual progression of 1.
These so-called perigean tides recur every anomalistic month of 27.
Consequently, the tidal variations caused by once-monthly so-called perigean tides are much more prominent.
While in most waters, the largest tides occur in the same part of the year, in the Bay of Fundy they are more influenced by the shifting coincidence of spring and perigean tides with the result that each year they occur about 47 days later than in the previous year.
24, perigean tides at Herring Cove in 1998 coincided with one of the month's set of spring tides around 19 February.
The 206-day cycle of perigean tides coincident with spring tides occurs all over the world, but it is far more pronounced (and far more important) in the Bay of Fundy because of the great tidal range.
Peaks of perigean tides
and spring tides coincide in cycles of 206 days.
3) Perigean tides of increased range occur once per month, when the Moon is nearest Earth.
The same work referred to perigean tides by observing that when the Moon "approaches the point nearest the Earth, its power increases, and then the rise of the sea is strong.
Indeed, in this region, high perigean tides
levels can be anticipated at intervals of 1 month, 7 months, 4.