A day is defined as a single rotation around earths axis. A year is a single rotation around the sun. The 356.2422 is the result of those two definitions. Earth takes 356.2422 rotations around its axis to rotate around the sun. That is a fact. You could define a unit to be 366th of a rotation around the sun, you could even call it a day, but as a result you lose the reason a day is a useful unit: It’s the time it takes for earth to spin around its axis, a far more useful definition than 366th of a year.




And because I really can’t help myself here is a static file version of the same calendar: https://files.catbox.moe/idfrdf.html. Running this is as easy as downloading the file and dragging it into your browser. Thanks to being able to quickly move between the years you can really see how little actually changes between them. I think this could actually be a viable calendar.