06-03-2009 - Astronomy Essentials

sagar: Author=’Bruce McClure’ program=” video=”Photo by Arby Reed.Ocean tides result from the gravitational interaction and the ever-changing geometry between the sun, moon and Earth.

Although high tides and low tides happen daily, extra large spring tides take place at the vicinity of new moon and full moon. Neap tides, which happen around first quarter moon and last quarter moon, display the mimimal variation between high and low tide.

These tide almanacs are based upon the _astronomical_ influences on the tides, not the hard-to-predict _meteorological_ factors, such as barometric pressure and wind.

Tidal Predictions by the National Ocean Service

WWW Tidal and Current Predictor by the University of South Carolina

Tide predictions around the globe by Tides.INFO

UK and Irish Tidal Predictions

XTide Tide Prediction Server

Written by Bruce McClure