Units of Length in Jaina Cannons

N. L. Jain’s paper analyses the systems of measurement found in Jaina canonical texts and focuses on units of length. Jain scriptures treat knowledge as empirical and stress the need for precise measurements to describe physical phenomena; they classify measures into lokika (worldly) and lokottara (transcendental) categories. Space itself is considered a real substance consisting of innumerable pradeśas (space‑points), and the volume of an atom is taken as the basic unit for measuring matter and space. Jain authors grouped length units into three classes: utsedha units for measuring the height of living beings, ātma units for small objects, and pramāṇa units for large distances. The practical base unit is the aṅgula (finger‑breadth), from which larger units like hasta (cubit), dhanus (bow), and yojana are derived. Subdivisions shrink to microscopic scales: from an aṅgula one obtains increasingly smaller units such as jaladhara, mukha, rasaṇa, and eventually the paramāṇu (indivisible atom). Conversely, some canonical texts describe cosmological distances using enormous measures like rajju, defined as a chain of yojanas extending unimaginably across the universe. Jain points out that different texts employ varying conversion factors: for example, some traditions define a yojana as four krośas while others assign 16, leading to discrepancies when calculating the size of islands, continents and cosmic structures. Because these units were never standardized and often changed across time and sects, scholars struggle to reconcile cosmological descriptions with each other or with modern measurements. The paper argues that a systematic comparison and standardization of Jaina length units is essential for a scientific understanding of ancient Jain cosmology and physics. Jain concludes by urging researchers to compile concordance tables and to study the rationale behind the classifications, noting that the Jain tradition’s sophisticated hierarchy of measures reflects its philosophical commitment to pluralism and precision in describing both the microscopic and macroscopic universe.

Summary reviewed by a volunteer editor.