August 6 has a gift for endings that contain beginnings, and beginnings that contain, somewhere inside them, a kind of ending. The date does not repeat itself — no two of its significant moments share a century — but they share a structure: something that had always seemed permanent is suddenly, irreversibly gone, and something else steps into the space it occupied. On August 6, 1806, Emperor Francis II dissolved the Holy Roman Empire of the German Nation.

Some dates produce men and moments that do not make sense until later. January 17 has a particular talent for this — for the warning given too soon to be heard, for the survival that arrives at too high a cost, for the birth of a mind that its own era could not fully contain. On January 17, 1706, Benjamin Franklin was born in Boston, the fifteenth of seventeen children of a candle and soap maker.

There are dates that reach. July 20 has, on at least three occasions across the twentieth century, been the date on which human beings attempted something they were not certain they could survive — and found out, in very different ways, what certainty was worth. On July 20, 1944, Colonel Claus von Stauffenberg placed a briefcase containing a kilogram of plastic explosive under a table in the Wolf’s Lair, Adolf Hitler’s field headquarters in East Prussia.

History does not usually return to the same address. It prefers to move on, to rearrange the furniture in a new room, to pretend it is doing something for the first time. But occasionally a date refuses to let it do that. June 28 is one of those dates — a calendar address that history has knocked on three times, each time with a different face and the same obscure necessity.

Some dates specialize. May 7 has, across three separate centuries and two world wars, developed a recurring relationship with the moment empires and armies admit they cannot continue. The pattern is not coincidence. It is the calendar doing what it does — accumulating weight until a date no longer belongs only to the year it inhabits. On May 7, 1915, the RMS Lusitania was struck by a German torpedo fourteen miles off the southern coast of Ireland.

The Germans have a word for it: Schicksalstag. Fate day. November 9 is theirs — not by design, not by any organizing intelligence, but through a series of violent coincidences that accumulated over seventy years until the date itself seemed to carry a kind of national gravity, pulling catastrophe and liberation alike into its orbit. It began, by most reckonings, in 1918. On November 9 of that year, Kaiser Wilhelm II abdicated the German throne, ending the Hohenzollern dynasty after 500 years.

There are days that do not begin wars. They announce them — standing at the edge of what has already been set in motion, making official what everyone has already understood. September 3 has had that function more than once: the date that formalizes an ending, ratifies a beginning, or simply states aloud what the situation already was. On September 3, 1783, American and British representatives signed the Treaty of Paris, ending the Revolutionary War.