The Earth is in an elliptical orbit around the Sun and rotates on its axis at a ratio of roughly 365.25:1. The axial tilt of the planet is such that the norther

The Earth is in an elliptical orbit around the Sun and rotates on its axis at a ratio of roughly 365.25:1. The axial tilt of the planet is such that the northern and southern hemispheres have varying seasons at different portions of the orbit and those seasons materially affect the life of most of the larger animals on the surface. There's not many intuitive ways to break that up unless you use a base365.25 number system. Calendars can definitely be weird but they're working around non-integer natural ratios.