Happy Year Day!

Celebrate theAbysmal New Year biannually.

theAbysmal Year Days fall 260 days from the New Year (Dec 21).

There are definitely 8 Rabbits celebrating on this tiny rustic table.

As a function of how the 365-day and 260-day calendars coincide, there are 2 year days during any given calendar year: one occurs 260 days before the New Year on Apr 5 (4 in a leap year), the other 260 days after the New Year on Sep 7 (6 in a leap year for now).

Dividing the Solar Year

A slice of the celestial pi.

The mean Tropical Year 365.24219 or 365.24217 days.

Mean Solar Crust

The solar calendars of the world organize the year into 365 days to approximate the Tropical Year. If it is important to keep the solar calendar in synch with the Tropical Year, then a leap day is added periodically.

The year is not a given, as there are various ways to measure and define the Earth’s orbit around the Sun relative to its rotation around its axis. If we use the ephemeris day, exactly 86,400 seconds, then the mean Tropical Year is 365.24219. If we use mean solar days, it works out to 365.24217.