How many years does September 24th of Gregorian calendar coincide with August12nd of lunar calendar?

1August, Year of the Dog, 898/Wednesday, kloc-0/2.

1977-09-24 August 12 Saturday Ding Sinian year of the snake.

1996-09-24, Year of the Rat, Tuesday, August 12.

Thursday, 20 15-09-24 12 is the year of the sheep.

Sunday, September 24th, 2034, August 12, Jiayin Year of the Tiger.

Basically once every nineteen years.