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