Shiksha is the science of correct Vedic pronunciation. Since the Vedas were transmitted orally for millennia before being written down, precise phonetic rules were essential to preserve every syllable unchanged across generations.
Vedic Sanskrit has three tonal accents: Udatta (raised), Anudatta (lowered), and Svarita (circumflex). Correct accent is critical — the Taittiriya Brahmana warns that wrong accent in a mantra can produce the opposite of the intended result.
The systematic classification of Sanskrit sounds by place of articulation (throat, palate, cerebral, dental, labial) and manner (stops, nasals, semivowels, sibilants). This analysis predates modern phonetics by over two millennia.
Rules for the length of vowels and syllables: hrasva (short, 1 matra), dirgha (long, 2 matras), and pluta (protracted, 3 matras). Precise duration is essential for Vedic chanting.
Eight modes of Vedic recitation that rearrange words in different patterns (Jata, Mala, Shikha, Rekha, Dhvaja, Danda, Ratha, Ghana). These elaborate patterns served as error-detection codes, ensuring the text remained unchanged across generations — an ancient form of checksum.