Accounts of Megasthenis (Greek Ambassador to Chandragupta courts), mention Sandracottus (Chandragupta) as Alexander's contemporary.
Sir Jones mapped Sandracottus to Chandragupta Maurya. Thus:
Maurya dynasty was placed in 300 BC.
Nanda dynasty placed in the range: 400 BC - 300 BC.
Gautam Buddha, Mahavir Jain, & Ajatshatru placed in 500 BC.
Adi Shankara placed 1000 years after Buddha in 800AD.
Shalivahan dynasty placed in 40 BC.
Gupta dynasty placed in 400 AD.
Halt! There are two Chandragupta: Chandragupta Maurya and Chandragupta Gupta. It was Chandragupta Gupta who was the contemporary of Alexander.
1. The Greek records mention the kings before and after Sandracottus to be Xandramas and Sandrocyptus. The kings before and after Chandragupta Maurya were: Mahapadma Nanda and Bindusar. The kings before and after Chandragupta Gupta were: Chandramas and Samudragupta. The phonetic similarity is quite apparent for Chandragupta Gupta and not Maurya.
2. Greek records are silent about important figures like: Chanakya, Ashoka (kingdom much bigger than his Gradfather Chandragupta's.)
3. Greek records do not mention the presence Buddhist monks who were very common in Maurya time.
4. Inscription on a Greek Tomb: "Here lies Indian Sramanacharya, Shakya monk from Bodh Gaya". Sramanacharya went to Greece with his Greek pupils. The tomb marks his death about 1000 B.C. Which means Buddha existed before 1000 BC.
5. The names of contemporary kings found on Ashokan inscriptions are Amtiyoka, Tulamaya, etc. Amtiyoka ruled Afghanistan around 1475 BC, which then appears to be the approximate date of Ashoka. (the grandson of Maurya Chandragupta.)
So a correct timeline for Indian History is:
3138-1634 BCE Shishunga and earlier dynasties
1634-1534 BCE Nanda
1534-1319 BCE Maurya
1294 BCE Kanishka of Kushan Dynasty
327 BCE Chandragupta Gupta
57 BCE Vikramaditya Gupta
1887-1807 BCE Gautam Buddha Why?
1864-1792 BCE Mahaveer Jain Why?
509- 477 BCE Aadi Shankaracharya Why?
1. Some Blunders of Indian Historical Research by P. N. Oak
2. The Age of Buddha, Milinda and King Amtiyoka and Yuga Puranaby K. Venkatachalam
3. Reestablishing the Date of Lord Buddha by Stephen Knapp
4. Chronology of Ancient Bharat by Professor K. Srinivasaraghavan
5. Antiquity and Continuity of Indian History by Dr. Prasad Gokhale
6. A Peep into the Past History by K. Rajaram
7. Indian Architecture by Thyagaraja Aiyer
8. Dates in Ancient History of India by Somayajulu
9. Shankaracharya aani tyancha sampradaaya by M.R.Bodas
10. Chronology of Nepal History by K.Venkatachalam
11. Orion by B.G.Tilak
12. The Arctic Home in the Vedas by B.G.Tilak
13. The Vedic Buddha Date by Vrin Parker
1. Kshemajit (reign 1892-1852 BCE) was the fourth in the Shishunag dynasty, and was a contemporary of Lord Buddha's father, Shuddhodana. It was during the reign of Bimbisara (reign 1852-1814 BCE), when Prince Siddhartha became the enlightened Buddha. Then it was during the reign of King Ajatashatru (1814-1787 BCE) when Buddha left this world.
2. According to the positions of the planets, during Buddha's time, Budhha existed in the Kruttika period, i.e. between 2621-1661 BCE.
3. The current date for Gautam Buddha was derived by European historians from Cylonese records. (Because those mentioned the most latest dates.) Nepalese and Bhaaratiya records for the person born on the Bharat - Nepal border are of course more reliable.
1. The Jaina tradition holds that Mahaveer left this world 15 years after the death of Bhagawan Buddha (1807 BCE), ie, in 1792 BCE, and since Mahaveer lived for a span of 72 years, he must have been born in 1864 BCE
2. Mahavir taught his philosophy during the reign of Ajatshatru ie. 1814-1787 BCE.
1. The date of Shankara, as per the current chronology, is 788-820 CE (derived from Shankara Digvijaya Sara) However, since the "sheet-anchor" is displaced backwards, it is apparent that the date of Shankara would be recalculated to be around 600 BCE.
Brihat Shankara Vijaya, gives a date of 509 BCE. Nepal Rajavamshavali states the date of 487 BCE.