cosmic alignment

There are only 4 people in my program and in a conversation on Monday we found out that we all celebrate our birthdays within 13 days of each other! Mine is first on Sept 12 and the last is Sept 25. We were all equally shocked to find this out. I'm curious if this is some sort of anomaly or if there is a lean in architecture towards late summer/early fall star signs.

It's very weird and also our studio prof's birthday is only a week later.

peace.