Back in 2014, he had made the megaliths of Jharkhand famous in Spain. Now, he is on a similar mission. Only, the country is different.

Subhashis Das, a self-taught "megalith explorer and researcher" of Hazaribagh, is all set to share his findings about the stone pillars erected by tribals as a symbolic tribute to their dead at the Eighth World Archaeological Congress, also known as WAC, in Kyoto, Japan, on August 29.

Das, who addressed a similar programme in Spain, said he was happy to get the invitation for Kyoto, which means experts from around the world would get to know about the megaliths.

Speaking to The Telegraph at his Nawabgunj Mohalla house, which he has named Equinox, on Wednesday morning, Das said he would fly to Kyoto on August 27.

"I will speak on the topic 'Exploring the diversity of sacred sites and sacred landscapes among tribal groups in the state of Jharkhand, East India'. This means I will be getting an international forum to speak about sacred groves, which the tribals refer to as Sarna, Jaher Sthan and Mandar. My research tries to explore why a grove or an ancient megalith is sacred to tribal people, the reasons for erecting megaliths in ancient time etc," he added.

A man intrepid enough to quit a well-paying job as a marketing professional in an MNC in 2000 to follow his passion for megaliths, Das, who turned 60 this July, pointed out that he was not an archaeologist, but a freelancer.

"I started researching about megaliths on my own, yet my paper was chosen to be presented in Kyoto. Prof. Dr. Terence Meaden, British archaeologist specialising in the neolithic and bronze ages, author and retired professor of Oxford University, had liked my research and books. He was one of the organisers of the Spain programme and has now called me to Japan. Actually, Meaden and his research firm are sponsoring me to the congress in Kyoto," added Das, who discovered the Pankri Barwadih Equinox site, some 17km from Hazaribagh town on Barkagaon Road in 2000.

Das was fascinated to find that during the two equinoxes on March 20 and September 22, when day and night are equal in length, the sun seemed to spring out of the twin megaliths at Pankri Barwadih. He started calling it the Equinox site.

"At present, I am working on my fourth book, which is solely on a few archaeo-astronomical megaliths of Jharkhand, slated to be released next year," said the megalith expert, whose first book, Sacred Stone of Indian Civilisation and Unknown Civilisation of Prehistoric India, and two more were highly appreciated across various national and international forums.

The researcher will board a train from Koderma station to Delhi on Thursday evening. On August 27, he will catch a flight to Shanghai and from there, he will take a bullet train to Kyoto, which was in news because of Prime Minister Narendra Modi's visit.