Orbital view — the cause
Sky dome — the result
Day 1
The analemma — EOT vs declination
Photograph the Sun from the same place at the same clock time through the year and the dots trace an analemma, not a single point.
Tilt moves the Sun north and south. Earth speeding up and slowing down in its orbit makes the Sun appear early or late. This tool lets you change those causes and watch the shape respond.