TradingView has a smart drawing tool called the Gann Fan to apply several Gann angles to the chart and other tools like the Gann Box and the Gann Square to visually identify key levels on a chart. Gann angles divide time and price into proportionate parts and are often used to predict areas of support and resistance, key tops and bottoms and future price moves. He used angles and various geometric constructions. A change in the direction of price is expected when the market reaches an equal unit of time and price, up or down. The trading techniques by WD Gann are widely seen as innovative and are still studied and used by traders today.
'30' is considered an important Gann value as it is one-twelfth of 360 (a year is divided in 12 months). In 1929 many of his contemporaries suffered significant losses as the Great Depression began. Gann regained the market’s’ attention beginning from late eighties when some of his materials resurfaced and his books were reprinted. Gann, a master of Wall Street in the early 20th century, combined mathematics, geometry and cyclical analysis to consistently make a profit during some of the most volatile market environments of the day. Gann was not mentioned in the investment communities. The most noteworthy angle is the 1x1 or the 45° angle, which represents one unit of price for one unit of time. The major bottom in SP500 of Decemout 45-degrees (calendar days) resulted in another major bottom for February 2, 2015, which also was 30-degrees (trading days). Gann passed away in 1955, there was a long period of time that the name of W.D. The angles are drawn from the main tops and bottoms while the chart is scaled appropriately to ensure the market has a square relationship. Several angles together make up a Gann Fan. Opinions are sharply divided on the value. The method is based on the notion that markets rotate from angle to angle and when an angle is broken, price moves towards the next one. Gann market forecasting methods are purportedly based on geometry, astronomy and astrology, and ancient mathematics. The trading techniques by WD Gann are widely seen as innovative and are still studied and used by traders today.