Explain the points of Ancient Indian Knowledge on the basis of which India was designated as 'Vishwaguru'.

Thought, language, and polity

• The Upanishads and the six darshanas (Nyaya, Vaisheshika, Samkhya, Yoga, Mimamsa, Vedanta) trained argument about self, matter, and valid knowledge (pramana), which visitors treated as a school of the world.
• Panini’s Ashtadhyayi is a generative grammar of Sanskrit unmatched in antiquity for compactness; Patanjali and later lexicons made language itself a science.
• The Arthashastra tradition and dharmashastra corpora stored statecraft, law, and revenue as teachable knowledge, not only as custom.
• Buddhist and Jaina canons, with logic (hetuvidya) and ethics, travelled to Central Asia, China, and South-East Asia, which is how the guru image left the subcontinent.

Mathematics, astronomy, and the body

• The decimal place-value system and the use of zero (shunya), matured in the work of Aryabhata, Brahmagupta, and later Bhaskara, are the strongest global claim in the Vishwaguru list.
• Sulba-sutra geometry for altars, trigonometric sine (jya), and planetary models in the siddhantas fed both ritual and astronomy.
• Charaka Samhita and Sushruta Samhita organised internal medicine and surgery, including surgical instruments and a theory of humours (tridosha), which Arabic and later European physicians encountered through translation.
• Metallurgy (Wootz steel, zinc distillation in Rajasthan, the Mehrauli pillar) and town planning memories of the Harappan age are often added; they are material knowledge, even where the literary trail is thinner.

Universities, and the critical use of the name

• Takshashila, Nalanda, Vikramashila, and Valabhi were residential universities with debate, libraries, and foreign students; Xuanzang’s Nalanda is the classic witness.
• Ayurveda, yoga, and music shastras show knowledge as a lived discipline, not only as a book.
• Vishwaguru becomes propaganda if every aeroplane and every vaccine is forced into a Vedic verse; the honest points are those that other civilisations actually borrowed or admired.
• A 12-mark answer therefore names pramana, Panini, zero, Charaka–Sushruta, and Nalanda, and refuses to inflate the list into a contest with modern laboratories.