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An In-depth Interpretation of Lixia in the Twenty-Four Solar Terms: Philosophical, Philological, and Astronomical Perspectives

This article provides an in-depth analysis of Lixia (the Beginning of Summer) through the lenses of pre-Qin Confucian and Daoist philosophy, etymological roots, and astronomical observation, elucidating its significance as the critical juncture where the cosmic momentum shifts from "birth" to "growth." By examining the evolution of the character "xia" (夏) and the movement of the star Antares, the study reveals the profound wisdom behind the ancient mandate of "respectfully bestowing the seasons" and the harmonious worldview of unity between humanity and the cosmos.

Tianwen Editorial Team May 6, 2026 13 min read PDF Markdown
An In-depth Interpretation of Lixia in the Twenty-Four Solar Terms: Philosophical, Philological, and Astronomical Perspectives

I. The Nature of Yueling: An Action Guide between Heaven and Man

Among all pre-Qin documents, the Liji ("Record of Rites"), in the chapter "Monthly Ordinances" (Yueling), provides the most systematic description of the month of the Early Summer (Mengxia). Yueling is not merely a calendar; it is an action guide linking astronomy, natural phenomena, and human administration.

Yueling opens by outlining the cosmic panorama for Mengxia: "In the month of Mengxia, the sun is in the Bi constellation, the Yi constellation is at the meridian at dusk, and the Wunü constellation is at the meridian at dawn." These positions provide the astronomical basis for the month.

It then describes the Five Phases attributes: "Its days are Bing and Ding; its Emperor is Yan-Di (The Flame Emperor); its deity is Zhu-Rong; its creature is the feathered; its sound is zhi; its number is seven; its flavor is bitter; its smell is scorched; its sacrifice is the hearth; its ritual offering is the lungs" (其日丙丁，其帝炎帝... 其味苦...).

Let us analyze this cosmic correspondence:

  • "Its days are Bing and Ding": These Ten Heavenly Stems are associated with Fire in the Five Phases.
  • "Its Emperor is Yan-Di": The Flame Emperor, or Shennong, is the god of agriculture and the Fire-emperor of ancient mythology. As the patron of the month, he embodies the Fire virtue.
  • "Its deity is Zhu-Rong": The fire god. In the Five Phases, Fire is in the South, and Zhu-Rong is the deity of the South, coordinating the summer.
  • "Its creature is the feathered": The Five Phases categorize creatures into scaled, feathered, naked (humans), furred, and shelled. The feathered are associated with summer, echoing the upward movement of Fire and the activity of birds.
  • "Its sound is zhi": The zhi note in the pentatonic scale is the most resonant and high-pitched, corresponding to the intensity of heat.
  • "Its number is seven": In numerology, seven corresponds to Fire.
  • "Its flavor is bitter": Bitter herbs often clear heat, which balances the heat of summer.
  • "Its smell is scorched": Similar to the smell of fire, matching the season’s energy.
  • "Its sacrifice is the hearth": The hearth is where fire is used in daily life. Sacrifice here bridges cosmic Fire and human life.
  • "Its ritual offering is the lungs": Linking body parts to the seasonal phases emphasizes the body-cosmos resonance.