oceanography pg18.html

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<FONT size="+1"><strong><B>Why Variance: </strong></U></P
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></B>1. Gravitational pull of sun relative to the sun's position (latitude)<FONT size="+1"> </P
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><FONT size="+1">2. Gravitational pull of moon relative to sun and earth<FONT size="+1"> </P
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><FONT size="+1">24 hours 50 minutes is lunar day length<FONT size="+1"> </P
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><U><FONT size="+1"><strong><B>Tide Producing Force: </strong></U></P
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></B>Varies directly with mass &amp; inversely with the cube of the distance<FONT size="+1"> </P
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><FONT size="+1">Sun 26,000,000 X (times) mass of moon<FONT size="+1"> </P
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><FONT size="+1">Sun is in space further out (93 million miles vs. 250 thousand miles)<FONT size="+1"> </P
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><FONT size="+1">Moon has 2 1/2(times) force of sun 6 = M/d<FONT size="+1"> </P
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><FONT size="+1">Tides - Usually twice per day in rhythmic fashion &quot;greatest waves of the ocean&quot;<FONT size="+1"> </P
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><FONT size="+1">Moon &amp; tides - tides like 50 minutes later each day (Tides Charts)<FONT size="+1"> </P
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><FONT size="+1">New &amp; Full moon - highest and lowest tides (Spring and Near Tides)<FONT size="+1"> </P
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><FONT size="+1">1st &amp; 3rd quarters lowest tides<FONT size="+1"> </P
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><FONT size="+1">(Slight lag behind 000)<FONT size="+1"> </P
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><FONT size="+1">Boston Harbor: 9-11 feet range - mean is 10 feet - storm surge 13-15 feet<FONT size="+1"> </P
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><U><FONT size="+1"><B><strong>Quadration vs. Syzygy: </strong></U></P
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></B>There is a variation in tide time and depth daily - Tidal charts/Almanal<FONT size="+1"> </P
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><FONT size="+1">(Winds, pressure, land, ect)<FONT size="+1">