Trends/Fibonacci and harmonic patterns

Fibonacci arcs

Curved lines around a swing high at fractions of the swing's length, mixing price and time.

Fibonacci and harmonic patternsBest on 6M, 1Y, 3YAlso called Fib arcs

Illustration of the Fibonacci arcs shape. It is a sketch, not real price data.

What it shows

Fibonacci arcs are half-circles centered on the end of a swing. Their radii are 38.2%, 50% and 61.8% of the straight-line length of the swing.

Because arcs mix price and time, their look depends on the chart's scale. Zooming changes the shape, which is a reason many analysts avoid them.

The same code that draws it on your chart follows these steps, with the same result every time.

Find a major swing: a swing low and a swing high.
Measure the straight distance between them on the chart.
Draw arcs centered on the swing high with radii of 38.2%, 50% and 61.8% of that distance.
Mark points where price touched an arc.

Starting values: Radii 38.2, 50, 61.8%; Centered on end of swing. These are proposed and will be tuned on real price data before launch.

Label	What it means
Inside the first arc	Price is within 38.2% of the swing length.
Between arcs	Between two arcs.
Outside all arcs	Beyond the 61.8% arc.

A close beyond the swing low.

Open any ticker and choose Fibonacci and harmonic patterns → Fibonacci arcs in the left menu.
Switch between 6M, 1Y, 3Y to see how the picture changes.
Compare with Fibonacci retracement and Fibonacci time zones on the same chart.

Why are arcs scale dependent?

A circle on a chart is stretched when the axes are rescaled.

Why include them?

They are available on many platforms and people ask for them.