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Tides at Goa now on NIO's website
Tidal phenomena was known to Indians since ages. Indian calenders are based on the journey of the moon which normally completes in 27 days. However in the modern science, it was Sir Isaac Newton, who provided mathematical explanation for the interaction between the Earth and the Moon in 17th century. He explained that the tides are caused by the difference in the force of gravity between the end of the Earth closest to the Moon, and the opposite end, which is furthest away. While the Moon is pulling at the waters of the seas closest to it, causing a high tide, at the opposite end of the Earth, the pull is the least. The prediction of tides is a long process. The behaviour of the tide is recorded by a tide gauge at each particular location. The results of analyses of these observations, known as tidal constants, are then used to predict the behaviour of the tide for any period for that specific location. It differs from place to place. NIO has placed one such gauge at Verem Jetty in Goa and the predicted values are matched with actual observed values. It is hoped that as the data gets accumulated, the predicted values will be most close to the observed values. The real time data (graphic representation) is now available from NIO's website (click on Tides of Goa on home page) with the time interval of every 5 minutes. As a value addition product, a link to Real-time weather at Dona Paula has also been provided below the tides graph. This provides graphic representation on four parameters: Wind speed, gust & direction, (b) temperature and relative humidity, (c) atmospheric pressure and (d) rainfall. The Surveyor General of India publishes the Indian Tide Table every year based on such predictions at the major harbours along Indian coastline. This is considered as most authentic source of information for the tides along Indian coastline. As a student project, the data for Marmagao port (in Goa) was fed to the database (currently for the year 2007). Anyone can now enquire on the database for the tides at Marmagao for a day or for a period of days. The query results in the form of a table and a graphic output. Many a times NIO receives queries on the tides and weather conditions at Goan coastlines from tourists and casual visitors. It is hoped that this feature would help them and all others including news agencies in providing information.
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