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Why do extra high tides not occur during solar eclipses?

High tides are created by the alignment of the sun and the moon, so why was today’s tide (4th Jan 2011 with a solar eclipse) just a moderate high tide?

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Tags: tides, solareclipse.

 

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tbrucenyc says:

Two quotes from the web:

"When the moon is full or new, the gravitational pull of the moon and sun are combined. At these times, the high tides are very high and the low tides are very low."

"An eclipse of the Moon (or lunar eclipse) can only occur at Full Moon

Tides built up here in NYC, up to 4.8 ft in height near dawn of the 5th.

01/01/2004 Thu 03:00AM LST 4.3  H 

01/02/2004 Fri 03:51AM LST 4.4  H 

01/03/2004 Sat 04:41AM LST 4.5  H 

01/04/2004 Sun 05:27AM LST 4.7  H 

01/05/2004 Mon 06:10AM LST 4.8  H 

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posted on 2011-01-07 22:20:17 | Report abuse


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Georg says:

so why was today’s tide (4th Jan 2011 with a solar eclipse) just a moderate high tide?

 

Hello,

which evidence do You have for that?

Georg

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posted on 2011-01-07 22:36:56 | Report abuse


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ecstatist says:

It was a LUNAR eclipse.

BTW spring tides occur a few days (2 for the North Sea) after the full (and new) moon due to the "lag" of the water system caused by the drag of the ground on the water. This is similar to hottest days occuring weeks/months after the longest day.

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posted on 2011-01-08 02:20:28 | Report abuse

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Georg says:

It was a LUNAR eclipse.

 

You should think about that one more time.

 

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posted on 2011-01-08 17:22:03 | Report abuse


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translatrix says:

I think it shouldn't make a difference to the tide if the alignment is quite perfect (solar eclipse, lunar eclipse) or just approximate (full moon, new moon).

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posted on 2011-01-09 17:02:55 | Report abuse

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dgwsoft says:

I think that is the answer. At every full moon and new moon the sun, earth and moon are approximately in alignment, and we get a "spring tide". When there is an exact alignment, there is an eclipse (solar at new moon, lunar at full moon). But it does not make much difference to the gravitatioal force whether the alignment is exact. E.g. if two forces F add in a direct line the resultant force is 2F. If they are 1 degree out of alignment the resultant is about 1.9997F. The sun and moon each appear about half a degree in size as seen from earth.

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posted on 2011-01-22 20:02:51 | Report abuse


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ecstatist says:

georg - I am presently on America west coast (where there was a partial lunar eclipse - it was raining,) and I did realize my global stupidity a day later - thank you

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posted on 2011-01-11 12:13:04 | Report abuse


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