The reason the distances are different is because these marking are on a round dial. The perspective is why there's a difference. It's noticeable on how the 25 looks so curved.
What's interesting here is the choice of scale. It's in base 4 instead of base 10. 0.8 cycles per year or rather, 1.25 years per cycle.
Scale this up to 5 years per 4 cycles, 10 years per 8 cycles or 20 years per 16 cycles.