Celestial Exalted Year
I sometimes wish there were 300 Sidereals so that there wasn't the disconnect for me in the idea that there are less Celestials than Terrestrials so Celestials are MORE powerful, and then there are less Sidereals than Solars so the Sidereals are LESS powerful.
Then again, sometimes I wish the Celestials numbered 420 or 425 each - 1 Solar, 1 Lunar and 1 Sidereal for every day/night of the year.
What if the year used to be 300 days long?
What if there were *supposed* to be 300 Sidereals, but production got interrupted because the Primordial War broke out a bit too soon because the Primordials started getting suspicious and the Unconquered Sun felt like he had to give the Go-order?
On the other hand, what if the year were once 700 days long, 1 day per Celestial Exalted, and 40% of Creation disappeared during the Primordial War, leaving 420 days? What if Calibration was added onto this as Creation warped to contain the shadowlands?
See my Exalted Calendar thoughts for related ideas.