It is very common for people to refer to the calendar rather than the calendars. Even that statement may seem odd unless you are aware that there are more than one. I'm not referring here to weird calendar systems being used long ago in far off lands, I'm referring to concurrent calendars in use in modern day Scotland by anyone living here (think civil, legal, academic, religious). Let's have a look at some of them and their starting points.
Calendar
Civil (Gregorian) calendar
Astrological calendar
Financial (tax year) calendar
Religious - Wheel of the Year
Starting Point
1st January
Sun enters Aries (between 19-23 March)
6th April
1st November
The fourth entry can be replaced by the systems used by the various religious groups as appropriate. Four new years, and that's excluding a bit of inter faith, I'm sure that the Bricket Wood Coven would approve.