When I built the low-cost and precise rotary encoder with magnetic spheres I used 21 spheres because they fitted nicely in the other parts of the build I had around.
However, if an arbitrary number of spheres is to be used then an appropriate holder must be built.
If you don't know Vihart and her "Hexaflexagon series", go check it out:
Sometimes there is the need to plot some events which have a periodic trend.
Let's consider a seasonal phenomenon; a typical plot may not fully highlight the regularity of the periodic behavior:
The mathematical model behind the JMP-rope, as for any rotating POV system, is the polar coordinate system.
Inspired and adapted from a math joke:
Why do computer scientists always confuse Halloween and Christmas? Because 31 Oct = 25 Dec.
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