The Earth leans 23.44 degrees, and that lean hands out sunshine unevenly. Near the equator a day is a day: twelve hours, give or take a few minutes, all year. At 78°N the sun simply leaves in autumn and does not come back until the following spring.
Drag the marker through the year and watch seven places trade light. Then unroll the chart into a flower: the closer to the equator, the rounder the petal.