Changes

== Jyotisha in Vedas ==

== Jyotisha in Vedas ==

Like many branches of knowledge, the beginnings of astronomy in Bharatavarsha have been traced back to the Vedas. Vedanga Jyotisha text is found in two recensions - Rigveda Jyotisha (called Archa-jyotisha) and Yajurveda Jyotisha (called Yajusha-jyotisha). Though the contents of both the recensions are the same they differ in the number of verses contained in them. Rigveda version contains only 36 verses whereas the Yajurveda version contains 44 verses, the difference attributed to the addition of explanatory verses given by the adhvaryu who used them.

Like many branches of knowledge, the beginnings of astronomy in Bharatavarsha have been traced back to the Vedas. Vedanga Jyotisha text is found in two recensions - Rigveda Jyotisha (called Archa-jyotisha) and Yajurveda Jyotisha (called Yajusha-jyotisha).<ref name=":15">Kolachana, Aditya & Mahesh, Kaluva & Ramasubramanian, K.. (2019). Main characteristics and achievements of ancient Indian astronomy in historical perspective. 10.1007/978-981-13-7326-8_24.</ref> Though the contents of both the recensions are the same they differ in the number of verses contained in them. Rigveda version contains only 36 verses whereas the Yajurveda version contains 44 verses, the difference attributed to the addition of explanatory verses given by the adhvaryu who used them.

Prof K. S. Shukla notes a third recension called the Atharva-jyotisha ascribed to Rshis Svayambhu and Bhrgu which belongs to a later date. This recension, consisting of 162 verses deals with both astronomy and astrology. It mentions the names of the seven planets and the weekdays. And in addition to tithi, nakshatra and yoga which were already known, it gives the names of the seven karanas of the Hindu calendar.<ref>K. S. Shukla, [https://www.insa.nic.in/writereaddata/UpLoadedFiles/IJHS/Vol04_1And2_11_KSShukla.pdf Astronomy in ancient and medieval India], Indian Journal of History of Science, Vol.4, Nos. 1-2 (1969), pp.99-106.</ref><blockquote>यथा शिखा मयूराणां नागानां मणयो यथा । तद्वद्वेदाङ्गशास्राणां ज्योतिषं (गणितं) मूर्धनि स्थितम् ॥ १९ ॥ (Veda. Jyot. 4)<ref>B.B. Datta and A. N. Singh (1962) ''History of Hindu Mathematics, A Source Book, Parts 1 and 2.'' Bombay: Asia Publishing House. (Page 7)</ref> </blockquote><blockquote>''yathā śikhā mayūrāṇāṁ nāgānāṁ maṇayo yathā । tadvadvedāṅgaśāsrāṇāṁ jyotiṣaṁ (gaṇitaṁ) mūrdhani sthitam ॥ 19 ॥''</blockquote>Like the crests on the heads of peacocks, like the gems on the hoods of the snakes (cobras), astronomy (mathematics) is at the highest position of vedanga shastras (the six ancillary branches of knowledge).

Prof K. S. Shukla notes a third recension called the Atharva-jyotisha ascribed to Rshis Svayambhu and Bhrgu which belongs to a later date. This recension, consisting of 162 verses deals with both astronomy and astrology. It mentions the names of the seven planets and the weekdays. And in addition to tithi, nakshatra and yoga which were already known, it gives the names of the seven karanas of the Hindu calendar.<ref name=":13">K. S. Shukla, [https://www.insa.nic.in/writereaddata/UpLoadedFiles/IJHS/Vol04_1And2_11_KSShukla.pdf Astronomy in ancient and medieval India], Indian Journal of History of Science, Vol.4, Nos. 1-2 (1969), pp.99-106.</ref><blockquote>यथा शिखा मयूराणां नागानां मणयो यथा । तद्वद्वेदाङ्गशास्राणां ज्योतिषं (गणितं) मूर्धनि स्थितम् ॥ १९ ॥ (Veda. Jyot. 4)<ref>B.B. Datta and A. N. Singh (1962) ''History of Hindu Mathematics, A Source Book, Parts 1 and 2.'' Bombay: Asia Publishing House. (Page 7)</ref> </blockquote><blockquote>''yathā śikhā mayūrāṇāṁ nāgānāṁ maṇayo yathā । tadvadvedāṅgaśāsrāṇāṁ jyotiṣaṁ (gaṇitaṁ) mūrdhani sthitam ॥ 19 ॥''</blockquote>Like the crests on the heads of peacocks, like the gems on the hoods of the snakes (cobras), astronomy (mathematics) is at the highest position of vedanga shastras (the six ancillary branches of knowledge).

== Contents of Vedanga Jyotisha ==

== Contents of Vedanga Jyotisha ==

The present day yuga system consisting of the chaturyugas and mahayugas (as seen in puranic references) is discussed under the heading [[Kala (कालः)|Kala]].

The present day yuga system consisting of the chaturyugas and mahayugas (as seen in puranic references) is discussed under the heading [[Kala (कालः)|Kala]].

The Vedic astronomers also noted that the shortest day was at the winter solistice when the seasonal year Shishira began with Uttarayana and rose to a maximum at the summer solistice. A glossary is given in the last section to explain the astronomical terms used in this article.

The Vedic astronomers also noted that the shortest day was at the winter solistice when the seasonal year Shishira began with Uttarayana and rose to a maximum at the summer solistice. <blockquote>''However, the Vedanga Jyotisha astronomy suffered from two main defects. Since there are actually 1826.2819 days in a yuga of five solar (sidereal) years and not 1830 as stated in the Vedanga Jyotisha, therefore if one yuga was taken to commence at a winter solstice the next one commenced about four days later than the next winter solstice and not at the next winter solstice. Similarly, since there are actually 1830.8961 days in a period of 62 lunar months and not 1830 as stated in the Vedanga Jyotisha, therefore there was a deficit of about one tithi in the yuga of five solar years. These discrepancies must have been rectified but we do not know when and how this was done.''<ref name=":15" /></blockquote>A glossary is given in the last section to explain the astronomical terms used in this article.

== Siddhantas ==

== Siddhantas ==