The
Earth tides present and display substantial
cyclical increases,
as a result of the different planes and
periods of rotation of the
Earth,
Moon and the Sun Each 4-5 years the Moon is
more near the one of the
Earth.
When this happens around the equinoxes, when
the Earth is but near the
Sun,
take place the astronomical tides more
discharges, whose differences
can
reach to the 20 centimeters respect to the
higher tides average. The
last
ones occurred in the 1997-98 and 2002-03.
The delay of the maximums and
minimums
(high water and low tide) of the tide
in 1 or 2 days with respect to the phases of
the Moon, must to the at
heart
oceanic water friction. This delay also can
soon be seen day day due
first
a the time which the stars in giving a
complete return take, and the
friction
that generate the tides according to their
amplitude.
