tides

     

Ties are the rising and falling of Earth's ocean surface caused by the tidal forces of the Moon and the Sun acting on the oceans. Tidal phenomena can occur in any object that is subjected to a gravitational field that varies in time and space, such as the Earth's land masses. (see Other tides).

Trivia about tides

  • The Bay of Fundy is famous for its range of these, the widest on Earth
  • These, like the spring type, are caused by the gravitational pull of the sun & the moon on the ocean
  • On parts of Australia's coast, the high & low ones may vary by only a foot or 2
  • Using trig with the periodic movements of the sun & moon, the times of high & low these can be determined
  • Like the moon's, the sun's gravity causes these on Earth, but they're half as high due to greater distance
  • The Moon's gravitation accounts for the diurnal & semidiurnal types of these
  • Computers can model these, neap type & all, so sailors don't have to rely totally on tables
  • In 2006 scientists argued that the westward trend of continents was due partly to these shifts in sea levels caused by the moon
  • Despite their name, spring these, caused by alignment of the Sun, Moon & Earth, happen in the ocean in every season
  • In parts of the Caribbean, these are on a diurnal cycle: one high, one low a day, that's it
  • As early as 600 A.D., monks recorded these on England's coasts & noted their relationship to the Sun & Moon

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