The month September has really its ups and downs:
"One year later, on Monday September 19, 1994, in what
he would call "the most important moment of [his] working life,"
Wiles stumbled upon a revelation, "so indescribably beautiful...
so simple and so elegant," that allowed him to correct the
proof to the satisfaction of the mathematical community.
https://en.wikipedia.org/wiki/Modular_elliptic_curve