Gann Angles are based on the 45-degree angle, known as the 1:1 angle. You may be surprised to know that Gann angles are based on the angle between prices and time (or inverse time). The reason why Gann angles are important is because they act as a gauge for trend strength. A trend with a strong trendline is considered bullish while a weak trend line indicates bears or even bulls and vice versa.Gann angles are a technical analysis tool used to measure trend strength. The Gann angle is based on a mathematical equation involving the degree of deviation from the 45-degree angle, also known as the "perfect" angle. If you're an avid trader and in need of some new insights.Gann angles are based on the 45-degree angle, known as the 1:1 angle. Gann believed the 45-degree angle is important and trends above this trend line are strong and trends below trends line weaker.