On land, speed is determined in kilometers or miles per hour, but when it comes to measuring the speed of water transport, the count is kept in some mysterious “nodes”. Where did this name come from and what does it correspond to in our time. In order to understand this, one should turn to maritime tradition and history.
At the dawn of seafaring, no special instruments existed for determining the position of a ship at sea. Continue reading
To measure at sea the distances between different points and the path traveled by the ship, a value called the nautical mile is adopted.
Nautical mile – the average arc length of one minute of the earth meridian.
The length of the arc of one minute of the earth’s meridian is 1 ‘= 1852.23 – 9.34 cos 2φ, where φ is the latitude of the ship’s elevation in degrees. Continue reading