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Achyutha Pisharodi (c. 1550 at Trikkandiyur, Tirur, Kerala, India – 7 July 1621 in Kerala) 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'' (''raasi'' meaning zodiac, ''gola'' meaning ''sphere'' and ''neeti'' roughly meaning ''rule''), Karanottama (1593) and a four- chapter treatise ''Uparagakriyakrama'' on lunar and solar eclipses. # ''Praveśaka'' #: An introduction to Sanskrit grammar. # ''Karaṇottama'' #: 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. # ''Uparāgakriyākrama'' (1593) #: Treatise on lunar and solar eclipses. # ''Sphuṭanirṇaya'' #: Astronomical text. # ''Chāyāṣṭaka'' #: Astronomical text. # ''Uparāgaviṃśati'' #: Manual on the computation of eclipses. # ''Rāśigolasphuṭānūti'' #: Work concerned with the reduction of the moon’s true longitude in its own orbit to the ecliptic. # ''Veṇvārohavyākhyā'' #: Malayalam commentary on the ''Veṇvāroha'' of Mādhava of Saṅgamagrāma (ca. 1340–1425) written at the request of Netranārāyaṇa. # Horāsāroccaya #: An adaptation of the ''Jātakapaddhati'' of Śrīpati. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Achyuta Pisharati」の詳細全文を読む スポンサード リンク
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