In his monumental linguistic and etymological work Nirukta, the ancient scholar Yaska systematically classified the entire corpus of Vedic deities into which three distinct cosmic spheres?

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Yaska in his Nirukta (dated around 5th century BCE) provided the earliest structured taxonomy of Vedic gods based on their spatial orientation. He placed Agni in the terrestrial sphere, Indra or Vayu in the middle atmospheric sphere, and Surya or Varuna in the highest celestial sphere.

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