The phrase "a sixtieth" is correct and usable in written English.
It can be used when referring to one part of a whole that is divided into sixty equal parts, often in mathematical or fractional contexts.
Example: "If you divide the cake into sixty pieces, each piece will be a sixtieth of the whole cake."
Alternatives: "one sixtieth" or "1/60th".
Not, as you might think, a sixtieth of a sixtieth of a twenty-fourth of the period of the Earth's rotation.
In "Notes for a Sixtieth Wedding Anniversary," from the new collection, Mayhall describes the simple service, in a parish house: "The cake I recall was Tastee brand".
Sea-freight emissions are less than a sixtieth of those associated with airplanes, and you don't have to build highways to berth a ship.
The camera is overrated as a psychological weapon; I am never wholly convinced by the theory that a "personality" — that vaguest and least easily classified of interior beasts — can be caught and tamed in a sixtieth of a second.
Fred had a sixtieth birthday symposium at which I had the pleasure of learning about some of his diverse work over the years, as well as presenting some of my own work.
The camera is overrated as a psychological weapon; I am never wholly convinced by the theory that a "personality"—that vaguest and least easily classified of interior beasts can be caught and tamed in a sixtieth of a second.
Then, last July, Penzler had a sixtieth-birthday party, and among his guests was a longtime customer of the bookstore, Sir Howard Stringer, the chairman of the Sony Corporation of America.
Currently on the shelves are fiftieth-anniversary editions of "Harry the Dirty Dog," "Eloise," and "Harold and the Purple Crayon," as well as a sixtieth-anniversary edition of "Stuart Little" and a sixty-fifth-anniversary edition of "Little House on the Prairie".
On October 28th, the day after May encouraged the victims of sexual crimes to go to the police, Michael Gove, her environment secretary and an intellectual force in the Brexit campaign, took part in a sixtieth-anniversary edition of the "Today" program, BBC radio's flagship for current affairs.
