Quote Originally Posted by handrawn View Post
they still have the same number of decades, except for the very first, which does a 'february' so to speak, and only has 9
A decade is always 10 years; there is no other definition. The ordinal "'Twenties" is 2020 to 2029. The cardinal decade of the calendar is 2011 to 2030. Bot are 10 years. So it all boils down to where you are cardinal or ordinal.

We have to posit handrawn is cardinal rather than print off a handrawn dictionary. It saves more trees.

February with 28 or 29 days is a different kettle and is a crude adjustment for our Sidereal year not being exactly 365 days.

Acorn