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Indian astronomy refers to astronomy practiced in the Indian subcontinent. It has a long history stretching from pre-historic to modern times . Some of the earliest roots of Indian astronomy can be dated to the period of Indus Valley civilisation or earlier.
In Hindu astronomy, there was an older tradition of 28 Nakshatras which were used as celestial markers in the heavens. When these were mapped into equal divisions of the ecliptic, a division of 27 portions was adopted since that resulted in a clearer definition of each portion (i.e. segment) subtending 13° 20′ (as opposed to 12° 51 + 3 ⁄ 7 ′ in the case of 28 segments).
Yuktibhāṣā (Malayalam: യുക്തിഭാഷ, lit. 'Rationale'), also known as Gaṇita-yukti-bhāṣā [1]: xxi and Gaṇitanyāyasaṅgraha (English: Compendium of Astronomical Rationale), is a major treatise on mathematics and astronomy, written by the Indian astronomer Jyesthadeva of the Kerala school of mathematics around 1530. [2]
As the name suggests, the book is a karana text, that is, a concise exposition of astronomy. Bhaskara's Karana-kutuhala was followed by Indian astronomers for several centuries, during which no other karana text was produced, until Ganesha composed Graha-laghava or Siddhanta-rahasya in the early 16th century.
A pakṣa (Sanskrit: पक्ष) is the time taken by the Moon to move from a new moon to a full moon and vice versa. The waxing phase of the moon is known as the bright side (Sanskrit: शुक्ल पक्ष, romanized: śukla pakṣa) and the waning phase is known as the dark side (Sanskrit: कृष्ण पक्ष, romanized: kṛṣṇa pakṣa).
Dhanishtha (Devanagari: धनिष्ठा, Telugu: ధనిష్ఠ, Kannada: ಧನಿಷ್ಠ), also known as Avittam in Tamil and Malayalam [1] (Tamil: அவிட்டம், Malayalam: അവിട്ടം), is the twenty-third nakshatra in Hindu astronomy, corresponding to α to δ Delphini.
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Drigganita (दृग्गणित; IAST: dṛggaṇita, from dṛk-gaṇita, "sight-calculation"), also called the Drik system, [1] is a system of astronomical computations followed by several traditional astronomers, astrologers and almanac makers in India.