the.com/lunar calendar
time told by a moon that refuses to divide evenly into anything.
means a calendar system that tracks months by the moon's phases, roughly 29.5 days each, instead of the sun's yearly cycle.
from predates writing itself, tracked on bone tallies over 20,000 years old, because the moon's phases are the easiest calendar nature hands you for free, no math required, just eyes.
the drift problem12 lunar months land 11 days short of a solar year
leap months fix itsome calendars insert a 13th month every few years
word originmonth literally comes from moon in old english
for instance
islamic hijri calendar — pure lunar, drifts through seasons, ramadan shifts 11 days yearly
chinese calendar — lunisolar, adds leap months, sets lunar new year date
hebrew calendar — lunisolar since antiquity, still governs jewish holidays today
babylonian calendar — oldest known lunar system, dates back to 2000 bce