The N-E-S-W circle rpresents the horizon. The yellow circle is the apparent path of the Sun in the sky during the day.
The path of the sun varies during the year. Drag the left scrollbar up for June solstice, down for December solstice, midway for March and September.
The figure is drawn for a latitude of 41 degrees N. To see the path of the sun from other latitudes, drag the right srollbar.