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In technical analysis, a series of angles plotted over a chart representing price and time. There are nine angles, each representing a different price movement; for example, when the angle is 45 degrees, it shows that price and time are moving identically with one another. A change in angle represents a possible change in price movement, which can either be confirmed or not by the following change in angle. Gann angles were first introduced in 1935, and their effectiveness of remains controversial.