For the second time in a project I'm working on, I've found that I need to sew a large spherical covering. There are basically two ways to do this. Sew together a few different geometrical shapes in the right configuration, much like a soccer ball:
Another way is to stitch together long tapered strips, like the rind on slices on an orange:
In both cases the orange slice method was the best option for me and the most straightforward to cut and sew. However, after scouring the web for patterns, both times I came up with what I considered substandard orange slice patterns. They were for smaller spheres, low quality images, hand drawn or with complicated instructions for generating, and nobody could really explain the math behind it so I could create my own pattern.
This time I figured it (again) and decided to make a pattern calculator so that my future self and anyone else interested would have slightly less trouble getting the right pattern. Thus was born the sphere pattern generator.