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'''''Sūrya Siddhānta''''' is an ancient Indian treatise in Astronomy. Like many classical Indian works, the ''Sūrya Siddhānta'' is a poem in [[Sanskrit]] language. It has fourteen chapter and 500 verses. It is composed in ''śloka'' metrical style of Sanskrit. It contain works on Indian sine tables, cosmology, eclipses, planetary motions, conjunctions, star positions, geography, instrumentation, concepts of time and mathematics. Unlike conventional books ''Sūrya Siddhānta'' contains advanced calculation and methods which are not easily comprehensible for a rank beginner. <ref>[https://insa.nic.in/writereaddata/UpLoadedFiles/IJHS/Vol45_4_1_ANarayan.pdf]</ref> The text had been updated several times and the last update appears to have  been made around 580 CE to the ''Nakshatra'' longitudes. In second chapter, the text contains the calculation of Earth's obliquity of ''1397 jya (R.sine) 23.975°'' modern units indicating the time of calculation around 3000 BCE. There are several other observations in the tradition of ''Indian Astronomy'' that were also recorded in the vicinity of 3000 BCE. This could possibly be the time of the origin of ''Sūrya Siddhānta'' although scholars do not seem to have a consensus on the origin of this text of ''Indian Astronomy''.

'''''Sūrya Siddhānta''''' is an ancient Indian treatise in Astronomy. Like many classical Indian works, the ''Sūrya Siddhānta'' is a poem in [[Sanskrit]] language. It has fourteen chapter and 500 verses. It is composed in ''śloka'' metrical style of Sanskrit. It contain works on Indian sine tables, cosmology, eclipses, planetary motions, conjunctions, star positions, geography, instrumentation, concepts of time and mathematics. Unlike conventional books ''Sūrya Siddhānta'' contains advanced calculation and methods which are not easily comprehensible for a rank beginner. <ref>[https://insa.nic.in/writereaddata/UpLoadedFiles/IJHS/Vol45_4_1_ANarayan.pdf]</ref> The text had been updated several times and the last update appears to have  been made around 580 CE to the ''Nakshatra'' longitudes. In second chapter, the text contains the calculation of Earth's obliquity of ''1397 jya (R.sine) 23.975°'' modern units indicating the time of calculation around 3000 BCE. There are several other observations in the tradition of ''Indian Astronomy'' that were also recorded in the vicinity of 3000 BCE. This could possibly be the time of the origin of ''Sūrya Siddhānta'' although scholars do not seem to have a consensus on the origin of this text of ''Indian Astronomy''.