GOLDEN RATIO & FIBONACCI

Being off by 0.3 degrees is enough to ruin it. Scatter seeds around a centre, turning each one by exactly the golden angle of 137.507 degrees, and they interlock without gaps while the visible crossing spirals always count out as consecutive Fibonacci numbers; set the angle to 137.2 degrees and the seeds snap into radial spokes with wasted gaps between them. The reason is that φ = 1.618… is the irrational number hardest to approximate by fractions, so multiples of the golden angle never fall periodically on top of one another. Claims that φ governs beauty in painting or human proportion, by contrast, are mostly overstated.

▸ Loading the constant φ = 1.6180339887…
▸ Building the sequence 1, 1, 2, 3, 5, 8, 13, 21…
▸ Calibrating the golden angle 137.507°
▸ Tiling squares & sowing sunflower seeds
▸ Drawing the logarithmic spiral…
▸ Ready — Online. ✅
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⌂ Mathematics

Simulation room Golden ratio & Fibonacci

Golden Ratio
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φ = 1.618… · golden angle 137.5°
Convergence to φ
🐚 Golden spiral
ratio Fₙ₊₁/Fₙ → φ
φ (golden)—
Ratio Fₙ₊₁/Fₙ—
Index n—
Seeding angle—
Element count—
Deviation from φ—
Tip
Each Fibonacci number is the sum of the two before; their ratio chases φ. Sow seeds spaced by the golden angle and they pack the tightest — that is why sunflowers, shells and pine cones all bear the mark of φ.
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Pick a mode on the right to see each phenomenon · drag the Angle slider in Sunflower mode
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Fibonacci ratio converging to φ with n ratio Fₙ₊₁/Fₙφ = 1.618
About Golden Ratio

Being off by 0.3 degrees is enough to ruin it. Scatter seeds around a centre, turning each one by exactly the golden angle of 137.507 degrees, and they interlock without gaps while the visible crossing spirals always count out as consecutive Fibonacci numbers; set the angle to 137.2 degrees and the seeds snap into radial spokes with wasted gaps between them. The reason is that φ = 1.618… is the irrational number hardest to approximate by fractions, so multiples of the golden angle never fall periodically on top of one another. Claims that φ governs beauty in painting or human proportion, by contrast, are mostly overstated.

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