Intertropical Convergence Zone Intertropical Convergence Zone The Intertropical Convergence Zone (ITCZ), known by sailors as the doldrums or the calms, is the area encircling Earth near the Equator, where the northeast and southeast trade winds converge. The ITCZ was originally identified from the 1920s to the 1940s as the "Intertropical Front" ("ITF"), but after the recognition in the 1940s and the 1950s of the significance of wind field convergence in tropical weather production, the term "ITCZ" was then applied. When it lies near the Equator, it is called the near-equatorial trough. Where the ITCZ is drawn into and merges with a monsoonal circulation,
Inter-Collegiate Sailing Association World War. Harvard and Yale held a sailing event in 1911, but this was a long-distance 'cruise' rather than a fleet or team race, and only one Yale yacht attended the event! What is now the US Inter-Collegiate Sailing Association (ICSA) was established in 1930 as the ICYRA, although inter-collegiate fleet racing had started in Eight-Metres in 1928 for what is now the McMillan Cup. The first inter-collegiate dinghy fleet event, the Boston Dinghy Club Challenge Cup, took place with 34 entrants in 1930 (in parallel with the founding of the ICYA), and there was a dinghy event between Princeton