Astronomy is considered to be the mother of the scientific method. It is known to have its origins in ancient Babylonia in around 2000 BCE with the discovery of information and quoted in the uniform tablets. Greeks developed a significant astronomical understanding under the natural philosophers like Aristarchus of Sanos, who studied the phenomenon of eclipses in 230 BCE. But there are significant contributions that have been provided by the Indian Astronomy since the prehistoric era. The Suras of Dhangah is considered to be one of the oldest astronomical texts in India. But did you know that this is a Dhangah might be as old as 5000 BCE that seemed astonishing to imagine that about 7000 years before the present, the people of ancient India were intellectual enough to study astronomy. In the next few minutes, we are going to explore the dating of this text by some astronomical references mentioned in Suras of Dhangah. The word siddhanta in Sanskrit means a thread as, and it usually has the author's name prefixed to it. Ancient Indian load speaks of 18 such works astronomy many of which have since been lost to us. The first three namely, Suras of Dhangah, Rama of Dhangah and Somas of Dhangah are the oldest and it needs so old that their authors are represented as the Divinity's Suriya, Brahma and so on. While it is generally supposed that the Suras of Dhangah is the oldest, some consider the Brahma's Dhangah to be the oldest. However, of all the Dhangahs, it is the Suriya that has always drawn the greatest respect and reverence and in which each topic is treated more fully than any other's Dhangah. Like many classical Indian works, the Suras of Dhangah is a poem in the Sanskrit language. It has 14 chapters and contains exactly 500 verses. The Sanskrit medical style is the one called Shloka. In the video on the tale of the 27 wives of the Pum, we saw the concept of Naksatras as being the 27 divisions of the Lunar War. The Surya Siddhanta has an identifiable style called a Yogadha of the Junchansana. The Surya Siddhanta provides two ways of identifying the Junchansana. The first is by the brightness and the second is by its position within that Naksana. There are many indications that the Surya Siddhanta has undergone several modifications in the past which in itself is a clue to the great age of the Dextra. It is important to know that we are going to consider the modern Surya Siddhanta which has been translated into English by Abenazar Burjans and edited by Fadindradar Gapu and the other translations of Bapu Deushas Thirya Svar. These two are considered to be the authentic translations of this text into English. We are going to analyse the Lajit Yudhan and Lattit Yudhan from Surya Siddhanta to find the year when it was composed. In Chapter 8, verse 1 of the Surya Siddhanta, the first line says that longitudes are given in our planets or one is to 60th of a degree. The second line indicates how to calculate the longitude of a star. For example, for the first Naksha-kara Ashmini, longitude is given as 48 in the text. We are called upon to multiply this by 10 to get the actual longitude in minutes that is 480 minutes or 8 degrees. The question naturally arises. If the longitude is 480 minutes, then why not indicate this value directly instead of 48 into 10? This second line is a subtle way of indicating that the precision of 10 minutes of arc is intended for this longitude in the data. This means it also gives the correction factor that should be considered. So now based on this, you must be thinking that all the values in the Surya Siddhanta would be highly precise up to the 4th decimal places, right? This is where it surprises you. Let's take a look at the longitude juvenile data from Surya Siddhanta. A glance at the Surya Siddhanta longitude juvenile data shows that nearly 85% of the data has been rounded up to the nearest degree. This is like using meters instead of kilometers to describe the distance between two cities but then rounding up the value from meters to whole kilometers anyway. It might be possible that the original high precision data was overridden with the values of the lower precision data at a later era. Perhaps because the great precision in longitude was considered to be a waste-edific. So let's try to find out when exactly was this update made to the Surya Siddhanta. Longitude juvenile data is affected by axial procession which as I mentioned, results in a fairly rapid change to the star's position of nearly 1 degree in every 71 years. We therefore expect to see a sizable difference between the longitude juvenile data in the Surya Siddhanta and its modern equivalent. This difference is a measure of the time elapsed between the last update the Surya Siddhanta and 2000 aerodominant. We observe that for several junction stars an approximate difference of about 20 degrees exists between two. From this, we may infer that the last update, the longitude juvenile data was made about 20 into 71 that is 1,420 years ago or about 580 AD during the time of war. But still the question remains, when was this text composed originally? We know from the above observation that the last update to Surya Siddhanta was done in 580 AD. But when was the Surya Siddhanta or the first version of the Surya Siddhanta actually written? Let us take a look at the latter-due-due data from Surya Siddhanta. Latter-due-due data, unlike longitude, is unaffected by axial recession. But it can change to root two other reasons. The first one being the planetary recession and the second one being the proper motion of the star. Here then is the main difference in using the Surya Siddhanta's latter-due-due data returning exchange. We are working with a variable that changes very slowly and to compound backers the data we have is of low present. Half a degree in latter-due this way or that way translates to several thousand years this way or that way. The one exception to this in Brawalu would be if the star had an exceedingly fast proper motion. And here we have the saviour in arqueous or the swati naksha. The proper motion is the action motion of the star in space and Surya Siddhanta gives the evidence that they had measured the proper motion of swati or arqueous. Comparing the Surya Siddhanta's latter-due-due data for arqueous with its modern value is an eye-opener. There is a difference of more than six degrees. Here is then another hint of the great age of this text. But let us be cautious. One of the six degrees has not been caused by proper motion alone. Some of it as we see later is due to planetary procession as well. To analyze this better, Anil Narayi, who is a former isro scientist, performed an analysis of the ecliptic variations and the proper motions of the stars. This analysis differentiates between the change in the additive data due to the planetary procession and due to proper motion. This thesis revealed some interesting results. One of the most astonishing assertions that it places is that from the latitude and time by varying the ecliptic-opliquity, ecliptic node location and ecliptic-sing variation, together with proper motion, a match for the Surya Siddhanta latitude and time-free was obtained in the time frame of 7300 to 7800 years before Christ, allowing for an error of 10 minutes of power for the change in the earth's publicity. It will take this value back to about 5000 years before Christ, which is still extremely ancient. Can you imagine that ancient Indians were capable of taking such precise measurements about 7000 years before present? Unfortunately, we are oblivious to this genius of our Indian ancestors. So let us take a step forward and try to explore our ancient Indian texts with a factual perspective. Stay tuned, stay educated and last but not the least, know your culture by self-investigating the truth.