Quite an amazing story as told in the New York Times of 8th April 1897.
Birkat HaHama is coming up again in a couple of weeks on the 8th April again. Last one was 28 years ago in 1981, though I don’t remember that at all.
The whole story of Birkat Hahama is pretty weird. If you want to know what it’s all about you can take a look at the article in Wikipedia. As it points out there, solar leap years do not strictly occur every 4 years so the whole thing is suspect anyway. That’s assuming you reckon the world was created in Nissan/April 5769 years ago and not in Tishrei/October of that year or like a few billion years earlier.