Units

The balanced structure of the Earthian Calendar makes it easy to divide the year into pieces that are equal within ±1 day.

millennia centuries generations decades years seasons months days
1 10 ~30 100 1000 4000 12000 365242 or 365243
  1 ~3 10 100 400 1200 36524 or 36525
    1 3.3 33 132 396 12053
      1 10 40 120 3652 or 3653
        1 4 12 365 or 366
        1/2 2 6 183 or 184
        1/3   4 121 or 122
        1/4 1 3 91 or 92
        1/6   2 60 or 61
            1 30 or 31