Tidal Enegi is caused by many things, including Gravity of the Moon and Earthquake.Today, Although not yet used, tidal energy has potential for future electricity generation. Tides are more predictable than the wind and the sun.

Tidal energy is the energy generated from the tides of sea water and makes it energy in other forms, especially electricity. Tidal energy is one type of renewable energy that is relatively more predictable in number than wind energy and solar energy. Its current utilization is not yet widespread because of the high initial cost and limited locations that have sufficient tides. Further research and development is continuously conducted to improve the efficiency and critical limits of the energy it generates so as to obtain various methods for extracting this type of energy.

In its history, tidal energy has been used in Europe and the east coast of North America in the form of turbines, converting them into mechanical energy and used to grind grain. New in the 19th century, this process was used to generate electricity. The first large-scale tidal power plant in the world is the Rance Tidal Power Station built in France and started operating since 1966.

Sea water is a fluid with a higher density, up to 800 times the air. In addition, the nature of tidal phenomena that can be predicted by region followed by continuous monitoring is able to maintain the supply of electrical energy from this type of power plant.

Penetrating Space & Time Vol.5 : Earth Movement Slows Down

Did you know that a day and a night, the time it takes the earth to rotate, in ancient times and now is different?
Earth Movement Slows Down Due To the Influence of Tidal Power of the Moon



Long research results with VLBI, combined with other fossil-based research, reveal that the Earth's rotation is slowing down. For the slowing of the Earth's rotation is the Tidal Power of the Moon. The moon itself is moving further away from Earth.


However, the mean solar day - the average length of a day, based on how long it takes Earth to rotate - is about 86,400.002 seconds long. That's because Earth's rotation is gradually slowing down a bit, due to a kind of braking force caused by the gravitational tug of war between Earth, the moon and the sun. Scientists estimate that the mean solar day has not been 86,400 seconds long since the year 1820 or so.



This difference of 2 milliseconds, or two thousandths of a second - far less than the blink of an eye - hardly seems noticeable at first. But if this small discrepancy were repeated every day for an entire year, it would add up to almost a second. In reality, that's not quite what happens. Although Earth's rotation is slowing down on average, the length of each day varies in an unpredictable way.

The length of day is influenced by many factors, especially the atmosphere over the periods less than a year. Our seasonal and daily weather variations can affect the length of the day by a few milliseconds over a year. Earths inner core (over long time periods), variations in the atmosphere and oceans, groundwater, and ice storage (over time periods of decides), and oceanic and atmospheric tides. Atmospheric variations due to El Niño can cause Earth's rotation to slow down, increasing the length of day by as much as 1 millisecond, or a thousandth of a second. (more...)

Leap Seconds
To maintain a standard fixed time as well as what happened with Earth, the Moon, and the Sun, the scientist then initiated a leap second in 1972.

The concept, the addition or even can a one-second reduction at certain times so that time remains in sync with the Earth's rotation. Leap second itself comes with the progress of measuring time, especially seconds, more precisely with cesium atoms.

There are some circles who want the removal of leap seconds because it is technologically inconvenient. For example, create a computer system error. But NASA itself predicts that if leap seconds are removed, then, in 500 years, the time on Earth will be different 25 minutes with time according to the actual rotational motion and Earth revolution.


Related Article :

Penetrating Space & Time Vol.1 : Atomic Clock