Many people tell old stories. 
Old books tell stories of long ago. 

Ancient Indian texts tell stories about time. These books are called the Epics and the Puranas. 
Many people believe time moves in cycles. These cycles are called yugas. There are four yugas in one cycle. The current age is the Kali Yuga. Some texts say one cycle lasts millions of years. These long times are hard to match with science.
The Puranas also list many royal families. These lists are called genealogies. They track kings from the start of time. One famous figure is Vaivasvata Manu. He is seen as the father of all people. 
Scholars study these books to learn about history. They look at the Bharata War. This war is a major event in the stories. Some thinkers use the books to find dates. Others use tools like archaeology to study the past. People still have many big debates about these dates today.
Ancient Indian traditions use special timelines to understand history. These timelines come from important texts called the Itihasa and the Puranas. 
Many people believe that time moves in large repeating cycles. These cycles are called yugas. There are four yugas in one single cycle. They are the Satya Yuga, Treta Yuga, Dvapara Yuga, and Kali Yuga. Each age has a different length of time. Some texts say a full cycle lasts 4,320,000 human years. The current age is the Kali Yuga, which is a time of darkness. This age began after the departure of Krishna. Some calculations place this start date around February 3102 BCE. This way of seeing time is very different from how we measure years today.
The Puranas are a huge group of books about ancient lore. They were likely written by many different authors over many centuries. These texts include long lists of royal families called genealogies. These lists track kings from the very beginning of time. One very important figure is Vaivasvata Manu. He is described as the father of all humanity. He is the son of the Sun god, Vivasvat. The texts say he had seventy children. These children started famous royal lines like the Solar and Lunar dynasties. 
Finding exact dates for these stories is a big task for scholars. There are many different versions of the ancient manuscripts. Sometimes these different versions say different things about when events happened. For example, some people use the Bharata War to mark a change in time. One inscription from 634 AD says the war happened much earlier. Other scholars use math and stars to find different dates. Some suggest the war happened around 1400 BCE. Others look at different clues to suggest even older dates. Because of this, there are many different opinions on the timeline.
Today, people use different tools to study these ancient ideas. Historians use archaeology and science to look at the past. They look at old bones, tools, and even DNA. Some scientists believe certain groups arrived in India after 2000 BCE. This idea sometimes clashes with what the ancient books say. Because of this, there are many lively debates among authors. Some people believe the traditions are an unbroken line of history. Others think the stories are partly mythical. It is a wonderful puzzle that people are still trying to solve.
Epic-Puranic chronology is a complex system of timelines found in Hindu tradition. These timelines are based on sacred texts called Itihasa and the Puranas. The Itihasa consists of two major Sanskrit epics: the Mahabharata and the Ramayana. The Mahabharata tells of the Bharata War between two groups of cousins. The Ramayana follows the life of Prince Rama of the Kosala Kingdom. These texts are authoritative in Indian tradition. They record cosmogeny, royal genealogies, and legendary events. They help people understand the history and the spiritual structure of the world. 
Time in the Puranas is viewed as a series of repeating cycles. These cycles are known as yugas. One full cycle contains four distinct ages: the Satya Yuga, Treta Yuga, Dvapara Yuga, and Kali Yuga. The Satya Yuga is a time of truth and righteousness. The Treta Yuga follows it. The Dvapara Yuga comes next. The final age is the Kali Yuga, described as a time of darkness and non-virtue. According to the Manusmriti, these ages have different lengths in divine years. These lengths are 4800, 3600, 2400, and 1200 years. One full cycle equals 12,000 divine years.
When converted to human years, these cycles become much longer. The lengths are 1,728,000, 1,296,000, 864,000, and 432,000 years respectively. This results in a total cycle of 4,320,000 human years. The ratio between these four yugas is 4:3:2:1. We are currently living in the Kali Yuga. Puranic sources state that the departure of Krishna marked the start of this age. Many traditions date the beginning of the Kali Yuga to February 17 or 18, 3102 BCE. This event occurred twenty years after the Bharata War. 
The Puranas also provide extensive genealogies of monarchs and scholars. These lists are used to create a traditional chronology of ancient India. A central figure in these lineages is Vaivasvata Manu. He is considered the progenitor of humanity. He is the son of the Sun god, Vivasvat, and his wife Saranyu. Manu is said to have seventy children. These children founded the Lunar and Solar dynasties of the kshatriyas. These royal families play a major role in Vedic origin stories. Some scholars, like Gulshan, date the reign of Manu Vaivasvata to 7350 BCE.
The Bharata War serves as a major chronological anchor. However, finding its exact date is difficult because of many different sources. The Aihole inscription, dated 634 CE, suggests the war happened in 3101 BCE. Other astronomers, such as Varahamihira, suggest a date of 2449 BCE. Some Puranic genealogies suggest the war happened around 1400 BCE. This is about 1,000 years before the Nanda dynasty. Other estimates from scholars like F.E. Pargiter suggest it could be as early as 1900 BCE. These contradictions exist because many different manuscripts and texts exist.
Modern scholars use different methods to study these ancient timelines. Western historians often view the Epic-Puranic chronology as partly mythical. They compare these texts to archaeological and genetic evidence. The Indo-Aryan migration theory suggests Aryans entered India after 2000 BCE. This theory contradicts the Puranas, which suggest Aryans have always been in India. Because of this, there is a lively debate among authors. Proponents of the Indigenous Aryans theory argue for an earlier dating. They suggest Indian civilization is an unbroken tradition from the Sindhu-Sarasvati Valley. This valley tradition is dated between 7000 BCE and 8000 BCE.
Different layers of history are embedded within the texts themselves. The bulk of the Mahabharata was likely compiled between the 3rd century BCE and the 3rd century CE. The oldest preserved parts may date back to 400 BCE. The Ramayana has various stages of development from the 7th to the 4th centuries BCE. The Puranas are a vast genre composed mostly in the first millennium CE. They are often anonymous and the work of many authors. Some scholars, like Gavin Flood, link the Puranas to the rise of devotional cults. This shows how literature, religion, and history all connect in the ancient world.
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