Sunflower heads and Fibonacci spirals

We draw each seed as a circle, characterised by 3 parameters:

• distance from the centre of sunflower
• angle from the centre of sunflower
• radius of seed (fixed)

We draw 900 seeds.

Each seed i has

• a distance from centre of sqrt(i) * radius
• an angle from centre of i * angleIncrement.

The angle increment is based on the decimal part of phi, the golden ratio. The angle increment options are:

Use 1 - phi ( where phi is (1 + sqrt(5))/2 )
Approximate 1 - phi by successive Fibonacci numbers ratio 55/89
Approximate 1 - phi by successive Fibonacci numbers ratio 34/55
Approximate 1 - phi by successive Fibonacci numbers ratio 21/34