Why just four seasons? Ancient Japan had 72 microseasons

Spring. Summer. Fall. Winter. Boring. Ancient Japan had 72 microseasons each lasting about five days. They each have wonderfully evocative names like "Spring Winds Thaw the Ice" and "The Maple and Ivy Turn Yellow." We just finished "The Bear Retreats to its Den," and this microseason 64, falling immediately after the solstice, is called "The Common Heal-All Sprouts. (more")