When studying W.D. Gann’s methods, the “square of 90” stands out as one of his most fascinating tools. While most traders know about the Square of 9, the Square of 90 is often overlooked. However, it was a vital part of how Gann timed and measured market movements with astonishing accuracy.
In this post, we will dive deep into how Gann used the Square of 90, why it worked, and how you can start applying its principles to your own trading today.
What is the square of 90
The Square of 90 is a simple but powerful concept. Imagine taking a circle (360 degrees) and dividing it into four equal parts. Each quarter of the circle represents 90 degrees. These divisions are crucial in market analysis because markets often make important moves around these 90-degree intervals.
In Gann’s view, price and time could both be mapped in degrees. Therefore, a 90-degree move was not just a technical measurement. It was a natural point where energy changed, often leading to important highs, lows, or reversals.
The Square of 90 helped Gann calculate:
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Future resistance and support levels
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Likely timing points for a trend to change
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Key price zones where momentum might shift
Understanding this simple division of the circle gave Gann an edge because he was able to anticipate market reactions before they became obvious.
How Gann applied the square of 90 in trading
Gann used the Square of 90 in several ways, and once you see the logic, it becomes much easier to understand.
1. Measuring time cycles
If a major market bottom occurred, Gann would project 90 calendar days or 90 trading days forward. He would then look for a possible reversal or trend change at that point. Often, important moves happened around the 90-day mark, or a multiple of it.
Sometimes, Gann even watched 45 days (half of 90) or 180 days (double of 90) for significant moves. These natural divisions of time helped him stay ahead of market swings.
2. Identifying price targets
After a major price move, Gann would apply the 90-degree principle to project future price levels. For example, if a stock moved from 100 to 110, a 90-degree move could suggest the next major resistance might come after another 10-point move or a proportionate distance based on the structure of the move.
By layering time and price projections together, Gann could set up incredibly precise trading plans without needing to rely on news or rumors.
3. Combining time and price
The real magic of Gann’s methods came from combining time and price. For example, if a price level and a time cycle both aligned around a 90-degree division, it was a powerful confirmation. Gann would consider this a high-probability zone for a market move.
Today, modern traders can use specialized indicators to automate some of this analysis, saving hours of manual calculations and making it easier to spot these opportunities.
Why the square of 90 works
You might wonder why markets respect these 90-degree divisions. It comes back to natural law.
Think about how the seasons change: every 90 degrees around the sun marks a major seasonal shift. Similarly, markets move in cycles that reflect natural rhythms of energy, fear, and greed.
By tapping into these natural cycles, Gann’s Square of 90 was not just based on arbitrary mathematics. It was rooted in the very structure of how change happens, both in nature and in human behavior.
This is why, even today, if you study major turning points in markets like gold, crude oil, or the S&P 500, you will often find key reversals happening around 90-day or 180-day cycles from previous highs or lows.
A simple way to use the square of 90 today
If you want to start using the Square of 90 in your own trading, here is a simple exercise:
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Pick a major low or high on a chart.
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Count forward 90 calendar days and 90 trading days.
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Mark these dates on your chart.
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Watch price action carefully around these windows.
If you also have a price target based on previous moves (for example, a proportional move from a prior high or low), and if time and price align around the same point, that is your high-probability setup.
By practicing this regularly, you will start to see how markets often “respect” these natural divisions without any need for complex analysis.
Modern indicators can make this even simpler by automatically plotting these key time and price divisions, helping you stay focused on trading instead of spending hours calculating by hand.
In our Lunar Mastercourse, we teach you exactly how to use Gann’s time and price techniques in a step-by-step, practical way, so you can apply them confidently.
Common mistakes when using the square of 90
Many traders who try to use Gann’s Square of 90 make the following mistakes:
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Only focusing on price or only on time: Gann always combined both.
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Being too rigid: Sometimes markets react a few days early or late. It is not an exact science, but a natural tendency.
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Skipping confirmation: Even if you have a 90-day cycle, you should wait for signs like momentum shifts, patterns, or volume changes before trading.
Remember, Gann’s methods require discipline and observation. The Square of 90 is a tool, not a magic formula. Used properly, it can give you an incredible edge, but only if you respect the process.
This is why consistent practice and guided learning are key. In our Mastercourse, we include real historical chart studies to help you develop the eye for how time and price come together.
Conclusion
The Square of 90 is a brilliant example of W.D. Gann’s genius. By respecting natural divisions of time and price, you can spot key turning points long before most traders are even aware.
Starting simple, practicing with clean charts, and gradually layering your knowledge with the right indicators can make Gann’s principles a practical and powerful part of your trading strategy.
If you are serious about understanding Gann’s timeless methods, the Lunar Mastercourse at Gann Academy is the best place to learn in a structured, supportive way.
