The book like vedanga Jyotisha surya sidhanta and bhagavata purana written by ancient indians as old as 3500 years age reveal a lot of information with respect to universe
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Answer:
Vedas, Vedanga Jyotisha, Surya Siddhanta are known as "apaurusheyas" meaning that their author and their period is unknown. No serious attempt seems to have been made to determine the age of these "apaurusheyas".
In this short paper, an attempt has been made by the author to determine VEDIC AGE using Equinoxes and their precession. He relied heavily on available evidence in Rig-Veda, Vedanga Jyotisha, Brahma Siddhanta, Surya Siddhanta etc. and quoted extensively from these sources to support his contentions.
The Surya Siddhanta (lit. 'Sun treatise') is a Sanskrit treatise in Indian astronomy in fourteen chapters.[1][2][3] The Surya Siddhanta describes rules to calculate the motions of various planets and the moon relative to various constellations, and calculates the orbits of various astronomical bodies.[4][5] The text is known from a 15th-century CE palm-leaf manuscript, and several newer manuscripts.[6] It was composed or revised c. 800 CE from an earlier text also called the Surya Siddhanta.[3]
Verse 1.1 (homage to Brahma)
According to al-Biruni, the 11th-century Persian scholar and polymath, a text named the Surya Siddhanta was written by one Lāta.[6] The second verse of the first chapter of the Surya Siddhanta attributes the words to an emissary of the solar deity of Hindu mythology, Surya, as recounted to an asura (a mythical being) called Maya at the end of Satya Yuga, the first, golden age of Hindu mythology two million years ago.[6]
The text asserts, according to Markanday and Srivatsava, that the earth is of a spherical shape.[2] It treats earth as stationary globe around which sun orbits – a geocentric model – and makes no mention of Uranus, Neptune or Pluto,[7] since these planets are not visible without telescopes. It calculates the earth's diameter to be 8,000 miles (modern: 7,928 miles),[4] the diameter of the moon as 2,400 miles (actual ~2,160)[4] and the distance between the moon and the earth to be 258,000 miles[4] (now known to vary: 221,500–252,700 miles (356,500–406,700 kilometres).[8] The text is known for some of earliest known discussion of sexagesimal fractions and trigonometric functions.[9][10][11]
The Surya Siddhanta is one of the several astronomy-related Hindu texts. It represents a functional system that made reasonably accurate predictions.[12][13][14] The text was influential on the solar year computations of the luni-solar Hindu calendar.[15] The text was translated into Arabic and was influential in medieval Islamic geography.[16]