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The character 緯 is a phono-semantic compound, formed during the Warring States period in China. Its semantic component is the "silk" radical (糸), indicating its original association with weaving and textiles. The phonetic component is 韋 (wéi), which originally depicted feet circling around a walled enclosure, conveying a sense of "going around" or "surrounding." Combined, 緯 literally meant the "horizontal threads" or "weft" in a loom, which are shuttled back and forth across the vertical, stationary warp threads (経, "longitude"). Etymologically, the meaning evolved from the concrete textile term to the abstract geographical concept through metaphorical extension. In Chinese cosmological thought, the earth was conceptualized as a grand loom. The warp threads (経) were the fixed, north-south running longitudinal lines, while the weft threads (緯) were the horizontal, east-west running latitudinal lines that "wove" around the earth's globe. This conceptual framework was systematized in texts like the Confucian classics, where 経 represented the canonical texts and 緯 (wěi) were the apocryphal texts that "wove" commentary and divination around them. The kanji, along with the entire Chinese writing system, was introduced to Japan in waves, primarily from the 5th to the 8th centuries via the Korean peninsula and through direct cultural exchange with China. It was adopted into the Japanese language as part of the *on'yomi* readings, with the Go-on reading "i" (e.g., 緯度, *ido*, "latitude") becoming standard. The character's original meaning of "weft" is preserved in Japanese in words like 経緯 (keii, "warp and weft," meaning "details" or "circumstances"). A significant linguistic note is the divergence in the character's usage between China and Japan. While in modern Chinese 緯 (wěi) is used almost exclusively for "latitude," in Japanese it retains a stronger connection to its weaving origins, as seen in 経緯. Furthermore, the character 韋 in 緯 is a homophone for 違 ("to oppose" or "differ"), reinforcing the conceptual opposition and perpendicular relationship between latitude (weft) and longitude (warp), a relationship that is fundamental to both weaving and cartography.