The Day Out of Time marks the end of one solar cycle and the next.
The Day out of Time, which falls on July 25 each cycle, is the day before the new year.
The new year begins with July 26th and ends with July 24, only 364 days. The missing day is The Day Out of Time, giving the calendar 365 days.

This topic and others such as Day out Of Time is explained here, and perhaps you'll understand why it is celebrated.

Kin 163
Blue Resonant Night
I Channel in order to Dream
Inspiring Intuition
I seal the input of Abundance
With the Resonant tone of Attunement
I am guided by the power of vision
Castle 4: Yellow Southern Castle of Giving
Wavespell Red Earth

Waning Gibbous
Waning Gibbous