He said the most challenging times for Modi will come between 2015 and 2017 when there will be opposition to him from both within the party and opposition parties.
Chennai astrologer H. Venkataraman too is sure that Modi, who led the BJP into the election, will "certainly become prime minister".
But he warned of a major shake-up in December this year "due to changes in the planetary positions like the transition of Guru.
"The NDA government will be there but there may be changes at the leadership," Venkataraman told IANS.
Thakur, however, feels that Modi will rule "firmly, and generally peacefully, for an entire five-year term" during which period the economy will prosper in certain sectors.