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This video explains the concept of Great Circle, Small Circle, Rhumb Line, Convergency & Conversion Angle, which is a part of EASA ATPL ground training syllabus. Great Circle is any line on the surface of the earth where its plane cut the earth centre. Support the Channel https://www.paypal.me/AnsweringATPL Subscribe to Answering ATPL http://bit.ly/AnsweringATPL More videos on ATPL http://bit.ly/2OFfzL3 Connect with Me Facebook: / answeringatpl Twitter: / answeringatpl Instagram: / answeringatpl The shortest distance between two positions on the surface of the earth is connected via a Great Circle. When flying along great circle track will continually changing. A small circle is any line on the surface of the earth where it plane does not cut the earth centre. All parallel of latitude is a small circle except equator. Rhumb line is a line on the earth's surface, cutting all meridians at the same angle. When you fly a Rhumb line track, you are not flying a Great Circle Track, except when Flying along Equator and Meridian (Longitude). Covergency is the angle that one meridian on the earth’s surface makes with another. It equals the angular difference between the measurements of the great circle at each meridian. Convergence and Convergency gave similar meaning and can be used interchangeably. Convergence formula: • Earth Conv = CHLong × Sin Mean Lat • Chart • Polar Stereographic Conv = CHLong • Lambert Conformal Conv = CHLong × Sin Parallel of Origin • Mercator Conv = CHLong × Sin Parallel of Origin Conversion angle is the angle between the Great Circle Track and Rhumb Line Track. Reference Convergency Definition: http://aviation_dictionary.enacademic.com/1700/convergency Enjoy the Video… p/s: If you have any question regarding EASA ATPL’s questions, please share it in the comment. I will try to answer it as soon as possible, and I might post a video explaining the answer.