Chapter 1: The Original Meaning of "Xia": A Universe in a Character

I. Why is "Xia" (Summer) "Xia"$4

Before delving into the specific discussions of Lixia, we must contemplate the character "Xia" itself. Why use "Xia" to name the most intense and flourishing season of the year$5 What is the original meaning of this character$6

The oracle bone script forms of "Xia" have long been debated, but one widely accepted interpretation suggests it depicts a human figure with head, arms, torso, and legs—the image of an "adult" (daren). This is closely related to the character "Da" (大, Great). Indeed, in pre-Qin literature, "Xia" and "Da" are often used interchangeably. Although the phrase "The Middle Kingdom possesses the greatness of ritual, hence it is called Xia; it possesses the beauty of attire, hence it is called Hua" relates to later texts, the concept that "Xia" and "Greatness" are linked is rooted in antiquity.

Why should "Greatness" be associated with the name of a season$7 Here lies a simple yet profound observation of our ancestors: Summer is the season when all things become "great." Trees that sprouted in spring reach full foliage and provide shade by summer; seeds sown in spring begin to grow and thicken by summer. "Xia" as "Greatness" is a direct naming of this vigorous power of growth.

The Erya (an ancient dictionary) states: "Summer is Zhu-Ming (Red Radiance)" (夏为朱明). Zhu means red; Ming means light. Summer is the season of crimson and brilliance. This aligns perfectly with the Five Phases (Wuxing) theory, which associates summer with fire and the color red. Yet, "Red Radiance" conveys more than just color; it describes a cosmic energy state—between Heaven and Earth, yang energy is full, brightness is at its peak, and all things grow exuberantly within this radiance, reaching the state of "Greatness."

This leads to a deeper question: Why did our ancestors view "Greatness" as a state worthy of being specially named$8

II. The Philosophy of "Greatness": Starting from the Growth of All Things

In pre-Qin philosophy, "Greatness" was never a simple adjective, but a concept carrying profound philosophical implications.

Laozi repeatedly discusses "Greatness" in the Daodejing. He says: "There is a thing confusedly formed, born before Heaven and Earth... silent and empty, independent and unchanging, moving in a cycle and never exhausted, it may be the mother of the world. I do not know its name, so I reluctantly style it the 'Dao,' and for lack of a better term, call it 'Great'" (有物混成，先天地生... 吾不知其名，强字之曰道，强为之名曰大). To Laozi, "Greatness" is one of the names of the Dao. The Dao is "Great" because it encompasses everything, reaches everywhere, and is ceaselessly self-generating.

Summer is precisely the season when the Dao of Heaven and Earth reveals its "Greatness." The Dao of spring is "Birth"—microscopic, soft, and just stirring; the Dao of summer is "Growth"—abundant, robust, and freely expanding. If spring allows us to see the "Beginning" of the Dao, summer allows us to see its "Strength."

Laozi also says: "Great means passing; passing means receding; receding means returning" (大曰逝，逝曰远，远曰反). Greatness implies flowing, and flowing leads to the return. These few words outline a complete cycle of motion. Is the changing of the four seasons not the most magnificent manifestation of this cyclic movement$9 The "Greatness" of summer is not an end point, but a necessary path toward the "Harvest" of autumn. Lixia marks the beginning of the journey of all things toward "Greatness," but the end of this journey is precisely the "Return"—returning to the storage of winter and the birth of spring, then once again moving toward the greatness of summer.

Zhuangzi’s understanding of "Greatness" is even more grand. In "Free and Easy Wandering" (Xiaoyao You), he describes the gargantuan Kun-peng: "The back of the Peng, I do not know how many thousands of li it measures... when it rouses its wings and flies, they are like clouds hanging from the sky" (鹏之背，不知其几千里也；怒而飞，其翼若垂天之云). This is what "Greatness" is! And what is the meaning of this "Greatness"$10 Zhuangzi wants to tell us: True freedom requires sufficient "Greatness" to support it. That the cicada and the dove cannot understand the Kun-peng is not because they are stupid, but because they are too "small"—their life pattern is too limited to contain such grand freedom.

Applying Zhuangzi’s insight to our understanding of the seasons, we might say: The "Greatness" of summer is the way Heaven and Earth reveal their freedom and abundance. All things grow and expand exuberantly in summer; this is not blind inflation, but the freedom and fullness displayed by the Dao of Heaven and Earth at this specific time.

III. Why is "Xia" synonymous with "Hua"$11

In ancient Chinese, "Xia" and "Hua" (華, flowers/magnificence) were often used interchangeably. Huaxia is both the name of a people and a cultural concept rich in meaning. From the perspective of the seasons, "Hua" implies "flowers," and summer is indeed the time of supreme beauty when all things bloom.

The Shijing (Classic of Poetry) in "The Fourth Month" (Si Yue) says: "The fourth month is summer; the sixth month arrives with heat" (四月维夏，六月徂暑). The transition into summer in the fourth month aligns roughly with the established time of Lixia. In the world of the Shijing, what is the scene of summer$12

The Shijing in "July" (Qi Yue) describes in detail the phenology and human affairs of the four seasons: "In the fourth month, the yuan plant flowers; in the fifth month, the cicadas begin to chirp" (四月秀葽，五月鸣蜩). The flowering of the yuan and the chirping of the cicadas are the iconic phenological signs of summer’s arrival. Our ancestors did not rely on thermometers; they relied on these subtle observations. The blooming of a flower and the chirping of a cicada were, in their eyes, signals of the operation of the Dao of Heaven.

Why did our ancestors place such importance on these minor natural changes$13 Because in their cosmology, Heaven, Earth, and all things form an organic whole; any local change reflects the movement of the totality. The yuan plant does not "decide" to bloom in the fourth month; it is the inevitable result of the qi of Heaven and Earth reaching that stage. Similarly, the cicada chirps in the fifth month because the yang energy has reached a critical threshold, stimulating its life force. By observing these phenomena, our ancestors grasped the rhythm of the qi and thus arranged human production and life.

This is the essence of the solar terms—they are not artificial divisions, but objective nodes in the operation of the Dao of Heaven. Lixia was established as a solar term not because a sage king decided it on a whim, but because our ancestors discovered through long-term observation that at this point in time, everything—sunlight, temperature, precipitation, and phenology—undergoes a comprehensive shift. This transition is not a gradual change, but a "qualitative leap." While temperature changes may be incremental, the shift in the "qi" of Heaven and Earth has a relatively clear threshold. Lixia is that threshold.