Do you realize that somewhere in early history, we went from approx 360 days a year, to 365.25? What happened? Why do ancient calendars have 360, but then pretty much ALL calendars after a particular date, started having 365.25?
701 BC. It was a rhetorical question.
You are the one who said it was, "well known." Which is it?
June 28, 1942 Historical Events
1942 –
Nazi Germany started its strategic summer offensive against the Soviet Union, codenamed Case Blue