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Geographical Coordinates

The geographical coordinates are two: the latitude and the longitude. They determine the exact position of places and navigable means on the Earth’s surface. The network of geographical coordinates on the elliptic or on the sphere is a network of meridians and parallels. Is, in fact, a system of surface coordinates and presents in two […]
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Definitions at Earth

Shape of the Earth In reality, the shape of the earth is elliptic, slightly bulked around the equator and slightly flattened in the poles.In navigation, earth is considered to be a sphere given that the errors caused by this assumption are negligible. The Movement of the Earth The earth, being a spherical isolated body in […]
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History of Navigation

The first venture of man to use the aquatic element for his transportation took place when he observed that some objects could float on the water, and consequently could help him to achieve his purpose. Thus, starting by the tree log and by joining more than one, he constructed the first raft that was gradually […]
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The Role of Ηydrography

On 21st June each year the International Hydrographic Organization celebrates World Hydrography Day. Hydrography Day is an opportunity to increase public awareness of the vital role that Hydrography plays in everyone’s life. The theme for this year’s World Hydrography Day is: “Hydrography – underpinning the blue economy”. Hydrography and “Blue Economy” The term “blue economy” […]
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