Queen Anne knighted Isaac Newton during a royal visit to Cambridge, a gesture widely understood as political: Newton was standing for Parliament and the honor bolstered his campaign. By then Newton was Master of the Royal Mint and president of the Royal Society, decades removed from the Principia, and the knighthood cemented his status as England's most celebrated natural philosopher.
Meeting in the northern city of Tucumán, representatives of the United Provinces of the Río de la Plata signed a declaration severing ties with the Spanish crown. The move capped six years of armed struggle and set the stage for José de San Martín's campaigns to liberate Chile and Peru. July 9 became Argentina's national independence day, celebrated ever since with military parades in Buenos Aires.
In the aftermath of the British burning of Ulundi, the Zulu king's capital, resistance organized around King Cetshwayo collapsed through early July 1879. British commanders consolidated control in the following days, effectively ending large-scale Zulu military resistance after a war that had begun with the catastrophic British defeat at Isandlwana six months earlier.
As part of Operation Dominic, the United States launched a Thor rocket carrying a 1.4-megaton warhead that detonated in space above Johnston Atoll. The explosion, known as Starfish Prime, produced an electromagnetic pulse that damaged electrical systems nearly 900 miles away in Hawaii and generated radiation belts that disabled several satellites, including one of the world's first commercial communications satellites, Telstar, months later.
National Security Adviser Henry Kissinger, having faked a stomach illness in Pakistan to slip away undetected, landed in Beijing to begin two days of secret negotiations with Premier Zhou Enlai. The talks, kept hidden from allies and even most of Nixon's own cabinet, arranged the groundwork for Nixon's historic 1972 visit and the eventual normalization of US-China relations after over two decades of Cold War estrangement.
The Comorian parliament declared independence from France after a referendum in which three of the four main islands voted overwhelmingly to separate, while Mayotte chose to stay under French administration. The unilateral declaration angered Paris and set off decades of dispute over Mayotte's status, which remains a French overseas territory to this day, unrecognized as such by the African Union.
Skylab, America's first space station, re-entered the atmosphere after years of orbital decay accelerated by higher-than-expected solar activity. Most debris burned up or fell into the Indian Ocean, but chunks landed near the town of Esperance in Western Australia, which later fined NASA a symbolic $400 for littering, a fine finally paid decades later by a radio host.
In the early hours, lightning ignited the roof of York Minster's south transept, one of England's greatest Gothic cathedrals. Flames consumed centuries-old oak timbers before more than a hundred firefighters extinguished the blaze, and the collapse of the roof, deliberately allowed by fire crews to prevent the fire spreading to the medieval rose window below, saved the cathedral's priceless stained glass.