Group 1 - The summer solstice is the fourth solar term of summer and serves as a reminder for people to prepare for heat prevention and cooling [1] - In ancient times, it was customary for officials to take a three-day holiday during the summer solstice, a practice that persisted from the Tang to the early Song dynasties [2][3] - The summer solstice was historically significant for agricultural practices, marking the time for wheat harvest and ancestral worship [2] Group 2 - Dietary habits change during the summer solstice, with a preference for cooling foods such as various types of noodles, which are popular across different regions [4] - In addition to noodles, some regions also consume rice dumplings (粽子) during the summer solstice, although this practice has become more associated with the Dragon Boat Festival [4] - The tradition of counting "nines" from the summer solstice marks the transition from summer to autumn, reflecting the cultural adaptation to seasonal changes [6]