/kloc-At the end of 0/5th century, after the Italian navigator Columbus discovery of america, colonialists flocked to seize territory and plunder wealth. Due to the lack of horses in America, a large number of horses were trafficked from Europe to the West Indies via the Atlantic Ocean. At that time, there was no mechanical power-driven transport ship, and ocean transportation relied on wind-driven sailboats. When the mighty sailing team sailed to the latitude where the horse latitude was, there was trouble. For weeks, the sea was calm and the fleet could not sail. Coupled with the hot weather, fresh water and food are exhausted, so horses have to be slaughtered. People are still like this, let alone horses. A large number of horses starved to death or died of thirst were thrown into the sea, and many horse bodies were floating on the sea, so people called the latitude where the fleet was at that time "horse latitude".

Why is the weather weak and hot at the latitude where the horse is located? It turns out that this latitude is about 30 degrees north and south latitude, which happens to be the sea area controlled by the subtropical high center.

It turns out that in the equatorial region, which is always hot, the atmosphere is heated and expanded. In this way, more and more air accumulated over the equator, forming high pressure, and began to split in the north-south direction. Under the influence of geostrophic deflection, the air diverted over the equator is blown to the right by the south wind in the northern hemisphere and to the left by the north wind in the southern hemisphere. When the air travels to the high altitude near 30 degrees north and south latitude, it cannot continue to move forward, resulting in downward flow, which increases the near-surface air pressure and forms a subtropical high pressure area. Because there is no air moving horizontally, a subtropical windless zone is formed, which is the secret of "horse latitude". In fact, there is no wind not only at "Ma Latitude", but also in the equatorial sea area and the sea area at 60 degrees north and south latitude.