Achyutha Pisharadi


Achyutha Pisharodi was a Sanskrit grammarian, astrologer, astronomer and mathematician who studied under Jyeṣṭhadeva and was a member of Madhava of Sangamagrama's Kerala school of astronomy and mathematics. He is remembered mainly for his part in the composition of his student Melpathur Narayana Bhattathiri's devotional poem, Narayaneeyam.

Works

He discovered the techniques of 'the reduction of the ecliptic'. He authored Sphuta-nirnaya, Raasi-gola-sphuta-neeti, Karanottama and a four- chapter treatise Uparagakriyakrama on lunar and solar eclipses.
  1. Praveśaka
  2. : An introduction to Sanskrit grammar.
  3. Karaṇottama
  4. : Astronomical work dealing with the computation of the mean and true longitudes of the planets, with eclipses, and with the vyatūpātas of the sun and moon.
  5. Uparāgakriyākrama
  6. : Treatise on lunar and solar eclipses.
  7. Sphuṭanirṇaya
  8. : Astronomical text.
  9. Chāyāṣṭaka
  10. : Astronomical text.
  11. Uparāgaviṃśati
  12. : Manual on the computation of eclipses.
  13. Rāśigolasphuṭānīti
  14. : Work concerned with the reduction of the moon’s true longitude in its own orbit to the ecliptic.
  15. Veṇvārohavyākhyā
  16. : Malayalam commentary on the Veṇvāroha of Mādhava of Saṅgamagrāma written at the request of Netranārāyaṇa.
  17. Horāsāroccaya
  18. : An adaptation of the Jātakapaddhati of Śrīpati.

    Narayaneeyam

Pisharati is known to have scolded and provoked an errant Narayana to take up the Brahmin's duties of prayer and religious practices. He accepted Narayana as his student. Later when Pisharati was struck with paralysis, Narayana, unable to bear the pain of his dear guru, by way of Gurudakshina took the disease upon himself. As a result, Pisharati is said to have been cured, but no medicine could cure Narayana. As a last resort, Narayana went to Guruvayur and requested Thunchaththu Ramanujan Ezhuthachan, a great devotee of Guruvayoorappan, to suggest a remedy for his disease. Ramajunan Ezhuthachan advised him to compose a poetical work on the Avatars of Lord Vishnu beginning with that of Matsya. Narayana composed beautiful slokas in praise of Lord Guruvayurappan and recited them before the deity. He was soon cured of his disease.
The book of slokas written by Narayana were named Narayaneeyam. The day on which Narayana dedicated his Narayaneeyam to Sri Guruvayurappan is celebrated as "Narayaneeyam Dinam" every year at Guruvayur.