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2016 tide charts
Samara, Guanacaste, Costa Rica ~ Pacific Ocean Coast
Latitude 9.8833 ▪ Longitude -85.5333 ▪ Altitude 3 feet
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Tides are the cyclic rising and falling of Earth's ocean surface caused by the tidal forces of the Moon and the Sun acting on the oceans. Tides cause changes in the depth of the marine and estuarine water bodies and produce oscillating currents known as tidal streams, making prediction of tides important for coastal navigation. The strip of seashore that is submerged at high tide and exposed at low tide, the intertidal zone, is an important ecological product of ocean tides.
The changing tide produced at a given location is the result of the changing positions of the Moon and Sun relative to the Earth coupled with the effects of Earth rotation and the bathymetry of oceans, seas and estuaries. Sea level measured by coastal tide gauges may also be strongly affected by wind. More generally, tidal phenomena can occur in other systems besides the ocean, whenever a gravitational field that varies in time and space is present.
A tide is a repeated cycle of sea level changes in the following stages:
Tides may be semidiurnal (two high waters and two low waters each day), or diurnal (one tidal cycle per day). In most locations, tides are semidiurnal. Because of the diurnal contribution, there is a difference in height (the daily inequality) between the two high waters on a given day; these are differentiated as the higher high water and the lower high water in tide tables. Similarly, the two low waters each day are referred to as the higher low water and the lower low water. The daily inequality changes with time and is generally small when the Moon is over the equator.
The various frequencies of orbital forcing which contribute to tidal variations are called constituents. In most locations, the largest is the "principal lunar semidiurnal" constituent, also known as the M2 (or M2) tidal constituent. Its period is about 12 hours and 25.2 minutes, exactly half a tidal lunar day, the average time separating one lunar zenith from the next, and thus the time required for the Earth to rotate once relative to the Moon. This is the constituent tracked by simple tide clocks.
Tides vary on timescales ranging from hours to years, so to make accurate records tide gauges measure the water level over time at fixed stations which are screened from variations caused by waves shorter than minutes in period. These data are compared to the reference (or datum) level usually called mean sea level.
Constituents other than M2 arise from factors such as the gravitational influence of the Sun, the tilt of the Earth's rotation axis, the inclination of the lunar orbit and the ellipticity of the orbits of the Moon about the Earth and the Earth about the Sun. Variations with periods of less than half a day are called harmonic constituents. Long period constituents have periods of days, months, or years.
Sand Castle crated in Samara Beach
Castle was created on Friday, June 30, 2006 by Philip and Jill Aspegren and their three sons, Skyler, Laramie and Jadmin. The Aspegrens live in San José and work with the Viva Network viva.org helping create foster care solutions for children at risk through families in local churches.
Sunrise and sunset in Costa Rica are pretty consistent throughout the year, about 12 hours of daylight each day, from 6AM to 6PM, give or take. Moonrise and moonset are shown by the blue speckles which indicate moonlight intensity. The graphs also show that High Tide and Low Tide are most extreme during Full Moon and New Moon.
The Earth tides present and display substantial cyclical increases, as a result of the different planes and periods of rotation of the Earth, Moon and the Sun Each 4-5 years the Moon is more near the one of the Earth. When this happens around the equinoxes, when the Earth is but near the Sun, take place the astronomical tides more discharges, whose differences can reach to the 20 centimeters respect to the higher tides average. The last ones occurred in the 1997-98 and 2002-03.
The delay of the maximums and minimums (high water and low tide) of the tide in 1 or 2 days with respect to the phases of the Moon, must to the at heart oceanic water friction. This delay also can soon be seen day day due first a the time which the stars in giving a complete return take, and the friction that generate the tides according to their amplitude.
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