Malia
Crete
A Minoan Calendric
 Stone 

33 Small Hollows, 1 Large Hollow

A Lunisolar Calender

The "kernos" of Malia (Crete) has 34 circular "hollows"
clock-style on the outer perimeter of a  large circular stone
- one "hollow" at the top is larger than the rest.
This was a "luni-solar" calender.
 

The key clue is the number of small hollows - 33.
For a people calculating time by the moon, the "years"
quickly go out of phase with the seasons,
which of course are dependent on the sun.
 

The solution of the ancients here was simple. A lunar year of months (1 month = 29.5 days,  synodic period from one new moon to the next) is 29.5 x 12 = 354 days. In 33 years "lunar years", i.e. 33 x 354 days, this is equivalent to 11682 days.
 

 
32 "solar years" of 365 days is 11680 days, so that 32 "solar years" are equal to 33 "lunar years"  (less two days),
i.e. after 33 "lunar years" the position of the moon
with respect to the sun is identical and the cycle can start again.
This is still much like the  Muslim calender works.
 

A round "stone" representing the moon was set
one "hollow" forward every new moon until it
reached its 33rd repetition at the 34th larger "hollow"
in which a larger stone for the Sun always was located.
Then the cycle began again.