https://en.wikipedia.org/wiki/Day
Day. A quarter-day cycle at Midtown Manhattan, from afternoon to dusk. A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours, 1440 minutes, or 86,400 seconds. In everyday life, the word "day" often refers to a solar day, which is the length between two solar noons or times the Sun reaches ...