King Charles III set to visit Australia and Samoa on a trip spanning a dozen time zones

LONDON (AP) — King Charles III, who is 75 and battling cancer, will travel halfway around the world to Samoa this month to take his seat as the head of the Commonwealth and highlight the existential threat that climate change poses for Pacific island nations.

He will also return to Australia, a country that played a key role in Charles’ adolescence — giving him the chance to be an almost normal teenager during the six months he spent at Timbertop school outside Melbourne in the 1960s. The visit marks the first time since he assumed the throne that Charles will visit one of the 14 countries outside the United Kingdom where the monarch is head of state.

The tour, from Friday to Oct. 26, is a watershed moment for Charles, who is slowly returning to public duties after a hiatus following his cancer diagnosis in early February. The decision to undertake such a long journey is seen as a reflection of his workaholic tendencies and his wish to put his stamp on the monarchy after waiting some seven decades to become king.

“He doesn’t just want to be a sort of caretaker king, waiting in a sense for his own death and the accession of William,’’ said Anna Whitelock, a professor of the history of the monarchy at City University, London, referring to Prince William. “He wants to be active in the world.’’

Charles’ globetrotting itinerary comes as he works to shore up support for the monarchy at home and abroad two years after ascending the throne.

It’s a challenge the king will face in Australia, a country with a strong anti-monarchy movement.

Charles and Queen Camilla arrive in Australia with a schedule that includes a visit to Parliament House in Canberra, the Australian War Memorial and the Aboriginal and Torres Strait Islander