Let me tell you a basic principle. What does it mean to eat carrots in winter and ginger in summer without a doctor's prescription? Spring grows in summer and autumn is harvested in winter. A day is divided into four seasons, namely, vernal equinox (5: 00-7: 00), autumnal equinox (5: 00-7: 00), summer solstice (11:00) and winter solstice (1:00).