Total eclipse of the Sun.
It was also a very impressive thunderstorm. Some belief systems associate special powers to people born under such circumstances. Such a dramatic birth is an omen, some people say.
Haven’t received Britannica’s On This Day for July 10, yet. But the Wikipedia version has some neat tidbits. Including the births of Marcel Proust, Jessica Simpson, Nikola Tesla, Chiwetel Ejiofor, Carl Orff, Adolphus Busch, Béla Fleck, Jean Chauvin, and Jacky Cheung.
My guess is that Britannica will mention the Bahamas independence, the Louis XVI war declaration, the establishment of Vichy government, the birth of Calvin, and the Noriega sentencing.
As a Canadian, there’s a number of pieces of Canadiana associated with July 10 (as with any day).