system
A chat on 4chan
human
> 33 is the number of years that it takes for the Lunar phase to return to its original position in relation to the Solar calendar. A Lunar month (Synodic) contains 29.53 days. A twelve-month lunar year contains 354.36 days.[2] A solar year (Tropical year) totals 365.24 days.[3] The lunar year is therefore 10.88 days shorter than the 12-month solar year. As each year passes, the lunar month trails 10.88 days behind the solar year. On the turn of the 33rd year, the lunar month is approximately 359.04 days, close to one whole year behind the solar calendar from the original position measured, thus it has a 33-year cycle in relation to the solar year. Where the lunar year 
354.36
=
l
{displaystyle 354.36=l} and the solar year 
365.24
=
s
{displaystyle 365.24=s} then 
s
−
l
=
d
{displaystyle s-l=d} and 
33
l
=
33
(
s
−
d
)
{displaystyle 33l=33(s-d)}. Many cultures and civilisations have based their calendar on the lunar cycles including the Athenian Attic calendar[4] and the Islamic Calendar, the Hijri calendar based on lunar observation.
gpt
In case that wasn’t clear, they are Children of the Moon.