|What are the four tides we have each day?
|Question Date: 2005-03-12|
In Southern California we have two high tides and
two low tides each day. Generally one of the high
tides higher than the other (the "high" high tide)
and one of the low tides is lower. They are
caused by the gravity pull between the earth,
moon, and sun. The time of the tides changes by
about 50 minutes each day as the moon migrates
through its monthly cycle. You can see the tide
charts for Santa Barbara, CA
you live somewhere else, search for closest coast
to you at this website. The height of the tides
are compared to an average local low low tide.
So, a low tide of -0.1 ft is below average. A
high tide of 5 ft is pretty high in this area.
Some places (like Alaska) may have high tides of
more than 20
has a pretty good description and pictures
of how tides work. When you take physics some
day, you will learn an even more detailed explanation.
Due to gravity, the Sun and the Moon are always
pulling on the Earth and they cause the Earth to
bulge at the equator. During a Full Moon, for
example, the bulges will point towards the Sun and
the Moon (which are on the opposite sides of the
Earth at Full Moon). As the Earth rotates over one
day, each part of the Earth passes through these
two bulges, which are the high tides. The low
tides, then,are the times of day where a
particular part of interest of the Earth is not
where these bulges are.
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