What happened on the date November 21st and why am I drawn to it?

Question

My sister's dog, Roxie, has no set birthday, because the people at the pet shop where we got her didn't know her birthdate, only that she was born sometime in November. She's turning three this year, and I think she ought to have a birthday. I want her birthday to be November 21st, as I am especially drawn to that date, but I don't know what happened then, as I have a feeling something important happened Historically then. Does anyone know what it was?

Answer 1

The RSPCA gave my dog November 21 as her birthday! (Obviously it's an estimate as she was found wandering in the street aged roughly 8 weeks.) I can't find anything significant that happened on that day in history, although the following day was extremely significant for America as President Kennedy was assassinated on November 22 1963.

Answer 2

On this date in 1905, the initial set of Einstein's relativity equations were first published.

So, Roxie could be considered Rox E., for Einstein Rocks.