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Thrikkandiyoor Achyuta Pisharati (1550 – 1621) was a renowned Sanskrit grammar
Sanskrit grammar

The grammar of the Sanskrit language has a complex verbal system, rich Nominal_ declension, and extensive use of compound nouns. It was studied and codified by Sanskrit grammarians from the later Vedic period , culminating in the Pa?inian grammar of the 4th century BC....
ian, astrologer, astronomer and mathematician
Indian mathematics

Indian mathematics—which here is the mathematics that emerged in South Asia from ancient times until the end of the 18th century—had its beginnings in the Bronze Age Indus Valley civilization and the Iron Age Vedic culture ....
 of his time. He was a student of Jyestadeva and a member of Madhava of Sangamagrama
Madhava of Sangamagrama

Madhava of Sangamagrama was a prominent Indian mathematics-Indian astronomy from the town of Irinjalakkuda, near Cochin, Kerala, India, which was at the time known as Sangamagrama ....
's Kerala school of astronomy and mathematics. He is remembered mainy for his part in the composition of his student Melpathur Narayana Bhattathiri
Melpathur Narayana Bhattathiri

Melpathur Narayana Bhattathiri , third student of Achyuta Pisharati, was a member of Madhava of Sangamagrama's Kerala school of astronomy and mathematics....
's devotional poem, Narayaneeyam.

iscovered the technique of 'the reduction of the ecliptic
Ecliptic

The ecliptic is the apparent path that the Sun traces out in the sky during the year. As it appears to move in the sky in relation to the stars, the apparent path aligns with the planets throughout the course of the year....
'.






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Thrikkandiyoor Achyuta Pisharati (1550 – 1621) was a renowned Sanskrit grammar
Sanskrit grammar

The grammar of the Sanskrit language has a complex verbal system, rich Nominal_ declension, and extensive use of compound nouns. It was studied and codified by Sanskrit grammarians from the later Vedic period , culminating in the Pa?inian grammar of the 4th century BC....
ian, astrologer, astronomer and mathematician
Indian mathematics

Indian mathematics—which here is the mathematics that emerged in South Asia from ancient times until the end of the 18th century—had its beginnings in the Bronze Age Indus Valley civilization and the Iron Age Vedic culture ....
 of his time. He was a student of Jyestadeva and a member of Madhava of Sangamagrama
Madhava of Sangamagrama

Madhava of Sangamagrama was a prominent Indian mathematics-Indian astronomy from the town of Irinjalakkuda, near Cochin, Kerala, India, which was at the time known as Sangamagrama ....
's Kerala school of astronomy and mathematics. He is remembered mainy for his part in the composition of his student Melpathur Narayana Bhattathiri
Melpathur Narayana Bhattathiri

Melpathur Narayana Bhattathiri , third student of Achyuta Pisharati, was a member of Madhava of Sangamagrama's Kerala school of astronomy and mathematics....
's devotional poem, Narayaneeyam.

Works

He discovered the technique of 'the reduction of the ecliptic
Ecliptic

The ecliptic is the apparent path that the Sun traces out in the sky during the year. As it appears to move in the sky in relation to the stars, the apparent path aligns with the planets throughout the course of the year....
'. He authored Sphuta-nirnaya , Raasi-gola-sphuta-neeti (raasi meaning zodiac
Zodiac

Zodiac denotes an annual cycle of twelve stations along the ecliptic, the apparent path of the Sun across the heavens through the constellations that divide the ecliptic into twelve equal zones of celestial longitude....
, gola meaning sphere and neeti roughly meaning rule), Karanottama (1593) and a four- chapter treatise Uparagakriyakrama on lunar and solar eclipse
Eclipse

An eclipse is an astronomical event that occurs when one celestial object moves into the shadow of another. The term is derived from the ancient Greek noun , from verb , "I cease to exist," a combination of prefix , from preposition , "out," and of verb , "I am absent"....
s.

Narayaneeyam

Pisharati is known to have scolded and provoked an errant Narayana
Melpathur Narayana Bhattathiri

Melpathur Narayana Bhattathiri , third student of Achyuta Pisharati, was a member of Madhava of Sangamagrama's Kerala school of astronomy and mathematics....
 to take up the Brahmin's duties of prayer and religious practices. He accepted Narayana as his student. Later when Pisharoti was struck with paralysis (or rheumatism by another account), Narayana, unable to bear the pain of his dear guru, by way of Gurudakshina took the disease upon himself. As a result Pisharoti 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
Thunchaththu Ramanujan Ezhuthachan

Thunchaththu Ramanujan Ezhuthachan Malayalam ????????? ?????????? ???????????? is considered as the Father of the Malayalam language, because of his devotion to the language, his influence on the acceptance of the Malayalam alphabet, and his extremely popular poetic works in Malayalam....
, a great devotee of Guruvayoorappan
Guruvayoorappan

Guruvayurappan , also often written Guruvayoorappan, is a form of Vishnu worshipped and held in reverence by Hindus, predominantly in South India....
, to suggest a remedy for his disease. Ramajunan Ezhuthachan advised him to compose a poetical work on the Avatars (incarnations) of Lord Vishnu beginning with that of Matsya (Fish). 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
Narayaneeyam

Narayaneeyam is a devotional Sanskrit work, in the form of a poetical hymn, consisting of 1034 slokas. It was written by Melputhoor Narayana Bhattathiripad in 1586 and gives a summary of 14,000 verses of the Bhagavata Purana....
. The day on which Narayana dedicated his Narayaneeyam to Sri Guruvayurappan is celebrated as "Narayaneeyam Dinam" every year at Guruvayur
Guruvayur

Guruvayur is a bustling pilgrim town and a municipality in Thrissur district of the Indian States and territories of India of Kerala. It lies 25 km to the northwest of Thrissur city....
.