Chandas (छन्दस्) — literally "meter" or "metrical scheme" — is the second of the six Vedangas. While Shiksha governs the phonetics of individual sounds and accents, Chandas governs the patterned arrangement of those sounds into the regular meters in which the Vedic hymns are composed. Vedic literature is intensely metrical; the Rigveda, the Samaveda, and large portions of the Atharvaveda are entirely in verse, and even the prose Yajurveda contains many metered passages. The Chandas Vedanga gives the rules for reading, identifying, and composing within these meters.
Why Meter Mattered
Three reasons gave meter its central importance:
- Memorization. Regular meter is a powerful aid to oral transmission. A line whose syllabic structure is fixed cannot be casually altered without immediate metrical detection.
- Ritual efficacy. Each meter was associated with a particular deity, world, or cosmic function. A mantra in gāyatrī meter accomplished what a mantra in triṣṭubh meter could not.
- Beauty. The Vedic poets were artists. Metrical variation, the choice between meters, and the rhetorical effects of meter change within a hymn were elements of poetic craft.
The Unit of Meter — The Pada
The basic unit of a Vedic verse is the pāda (पाद, literally "foot," but in this context "verse-line"). A pada is a sequence of syllables that constitutes one line. Padas are combined in groups of three or four to form a verse (ṛc) and verses combined into hymns.
Meters are classified by the number of syllables per pada and the number of padas per verse. A meter with 8-syllable padas in a 3-pada verse is gāyatrī; a meter with 11-syllable padas in a 4-pada verse is triṣṭubh; and so on.
The Seven Principal Meters
The Vedic tradition recognizes seven primary meters, named in order of increasing syllable count per pada:
- Gāyatrī (गायत्री) — 3 padas of 8 syllables each = 24 syllables total. The shortest principal meter and the meter of the Gāyatrī Mantra (RV 3.62.10).
- Uṣṇih (उष्णिह्) — 3 padas, 8+8+12 = 28 syllables.
- Anuṣṭubh (अनुष्टुभ्) — 4 padas of 8 syllables each = 32 syllables. The meter of the śloka and of the vast majority of classical Sanskrit verse including the Bhagavad Gita.
- Bṛhatī (बृहती) — 4 padas, 8+8+12+8 = 36 syllables.
- Paṅkti (पङ्क्ति) — 5 padas of 8 syllables each = 40 syllables.
- Triṣṭubh (त्रिष्टुभ्) — 4 padas of 11 syllables each = 44 syllables. The most common Rigvedic meter.
- Jagatī (जगती) — 4 padas of 12 syllables each = 48 syllables.
Within each meter there are sub-types based on the patterning of long and short syllables — for example, the vasantatilakā and mandākrāntā variants in classical Sanskrit.
Patterns of Long and Short Syllables
In addition to syllable count, meters specify the pattern of long (guru) and short (laghu) syllables. A syllable is long if its vowel is long, or if a short vowel is followed by two consonants. The opening and closing of a meter typically follow a fixed pattern, while the middle may permit some variation. The triṣṭubh, for example, characteristically closes with the cadence — ‿ — — (long, short, long, long).
The Deity-Meter Correspondences
The Vedic tradition associates each meter with a particular cosmic level:
- Gāyatrī — earth, the Vasu gods, fire (Agni), the dawn-time of life.
- Triṣṭubh — atmosphere, the Rudra gods, lightning, the prime of life.
- Jagatī — sky, the Aditya gods, sun, old age.
A Rigvedic hymn often moves through meters in a deliberate sequence, beginning with one meter and modulating to another as the hymn progresses through different theological registers. This is felt by traditional commentators not as random variation but as a structural element of the hymn's meaning.
The Chhandahsutra of Pingala
The foundational classical text on meter is the Chandaḥsūtra (छन्दःसूत्र) of Piṅgala (probably 2nd century BCE), which systematizes both Vedic and classical meters. Pingala's work is celebrated in modern times for its accidental anticipation of binary mathematics: in describing combinations of long and short syllables he developed a notation and algorithms that are essentially equivalent to binary numerals and to what we now call the Fibonacci sequence. The 13th-century commentator Halayudha makes the binary structure fully explicit. Pingala's meru-prastāra — his "mountain of arrangements" — is identical to what Western mathematics calls Pascal's triangle.
Significance
To read the Rigveda is to read poetry — and poetry whose pulse one must hear to understand. The Chandas Vedanga preserves the technical knowledge that allows that pulse to be heard correctly across three thousand years. It is also the source from which both classical Sanskrit prosody and a remarkable strand of early Indian mathematics descend. Few of the Vedangas have had so broad a downstream influence.