[franciscop]

Not a single mention of the topic/reason calendars were invented in the first place: keeping track of the 4 seasons (for agriculture purposes). Though since each month has 4 weeks, I can see a season being 2.5 months making sense. At least much more than the 13-month year.

[robobro]

There are not 4 seasons near the equator; we use lunar calendars in Islam and Buddhism both in Indonesia

[Juliate]

Does it make use of the equinoxes and solstices or is it strictly lunar-based?