Daylight through 2026 at 39.8° N, the geographic centre of the contiguous United States. Time of day runs top to bottom, the year runs left to right; the lit band is the part of each day the sun is up, with civil twilight around it. The swing between the solstices is 5h 40m, and the two vertical steps are the Daylight Saving changes — they appear because these are clock times, not solar ones.