Michael V said:

Divine Angel said:

On April 12, 1961, Yuri Gargarin became the first spaceman.

Well remembered. I could only remember his name, not the date.

Credit to Wikipedia. My superpower is remembering birthdays, like my high school crush whom I’ve not seen or been in contact with in thirty years. His birthday is March 4. I don’t remember any other significant dates, especially if they occurred before I was born.