To demonstrate FF Chartwell Pies, I created 366 pie charts, each representing a day of the year. The dark pieces represent nighttime hours and the light pieces represent daylight hours, as observed here in San Francisco this year. The two dark shades separate portions of the day between midnight and sunrise, and between sunset and midnight. Noting the abrupt change in angle of the daylight, one can spot Daylight Savings going into and out of effect, and other nice patterns. Today’s pie chart is the 16th chart on the 10th row, first image. Select the images for a closer view.