No two days should be the same.
There is really no special day.
It is just called that for convenience, because the earth and the sun are in similar positions.

Even so, the biorhythms of living things seem to repeat in "years.
The earth appears to repeat in "years," so we apply it.

Humans, or organisms, are capable of perceiving similar things as similar.
Perhaps this power is what makes beauty appear.
If so, then the anniversary, called for convenience, may be the same activity that makes us perceive beauty.

I was born in Japan on April 6, 1998.