Radonić was born in Korčula, Croatia, where he finished primary school and high school. Between 1972 and 2017, he worked in the Technical Museum in Zagreb as a chairman of planetarium with astronautics.
Radonić was born in Korčula, Croatia, where he finished primary and secondary education. From 1972 to 2017, he worked as a leader of the planetarium at the Technical Museum in Zagreb with expertise in astronautics.