Beautiful poetic expression "wind rose" is called the strict heraldic sign octagon – a symbol of perfection and aspiration to fine, romantics of distant wanderings. And in fact is a strict mathematical chart.
History of the birth of the sign "Wind rose" goes far to depth of centuries. Initially it was a symbol of a navigation star at seamen. In the northern hemisphere such fixed star in a night sky is the Pole star. Sailors for a long time learned to determine the latitude of the place by it and to approximately define the location in the sea. Wind was the second reference point for experienced seafarers. Many sea winds are constant during certain periods of season, and, knowing these regularities, the captain adjusted the course and unmistakably brought the ship from a long voyage into the native harbor. So the symbol of a navigation star gained additional value, and star beams began to indicate parts of the world: North, South, East and West. The sign of the Wind rose which is pricked out on a shoulder was a peculiar amulet for sailors. It gave them confidence in correctness of a route and successful return to the home ground. Today it the tattoo is more symbol of search of a way – a guiding star. Intermediate points specify the northeast, the southeast, the northwest and the southwest, their beams in an eight-pointed wind rose is shorter.
Wind rose – the sign of a meteorological situation
Besides decorative value, the wind rose has also purely business, applied character bearing in itself necessary information. First of all, in one form or another the wind rose is used by meteorologists. By orders of the interested contractors, they build the vector chart which shows the mode of the winds prevailing in a certain territory for a certain period – month, a season, year, long-term values. Knowledge of a meteorological situation, the directions and force of the dominating air flows are necessary in many industries of managing and social construction. At construction of airfields it is necessary to choose the direction of runways that was "side wind" less. In town planning not to do without wind rose in any way: it is necessary to consider, where to place the industrial enterprises that did not bear the waste which is coming out their pipes with the wind on dormitory areas where to break the green space how to orient the main avenues not to "proskvozit" the city cold winds or, on the contrary, to raise "produvayemost" in the southern regions. Unlike a wind rose symbol – at the chart the beams have various length, and their length depends on the frequency of days when wind blows from this direction.