The remarkable catalog of dates is one of the longest-running records of climate change. Its creator died, setting off a search for a successor.

His visit includes a trip to a shrine where enslaved Africans were baptized before being forced into the treacherous voyage across the Atlantic Ocean.

To leftists abroad, Prime Minister Pedro Sánchez of Spain is a hero for standing up to President Trump. At home, Mr. Trump is seen as Mr. Sánchez’s political savior from thorny domestic challenges.