Context: Artifacts from the Paleolithic suggest that the moon was used to reckon time as early as 6,000 years ago. Lunar calendars were among the first to appear, either 12 or 13 lunar months (either 354 or 384 days). Without intercalation to add days or months to some years, seasons quickly drift in a calendar based solely on twelve lunar months. Lunisolar calendars have a thirteenth month added to some years to make up for the difference between a full year (now known to be about 365.24 days) and a year of just twelve lunar months. The numbers twelve and thirteen came to feature prominently in many cultures, at least partly due to this relationship of months to years. Other early forms of calendars originated in Mesoamerica, particularly in ancient Mayan civilization. These calendars were religiously and astronomically based, with 18 months in a year and 20 days in a month.

Question: Artifacts from which era suggest that the moon was used to reckon time around 6,000 years ago?
Answer: the Paleolithic

Question: Which calendars were among the first to appear?
Answer: Lunar calendars

Question: How long were the original lunar calendars?
Answer: either 12 or 13 lunar months (either 354 or 384 days)

Question: Where did some of the other early forms of calendars originate?
Answer: Mesoamerica

Question: How many months were in a year in the original Mayan calendars?
Answer: 18

Question: During what time period did the Mesoamerican age appear?
Answer: Unanswerable

Question: When did the Mayan civilization first appear?
Answer: Unanswerable

Question: How many days did it take to date artifacts from the Paleolithic?
Answer: Unanswerable

Question: How many artifacts were found that connected the moon to Mayan culture?
Answer: Unanswerable

Question: What culture was the first create artifacts that were found?
Answer: Unanswerable

Question: Artifacts from which era suggest that the moon was used to reckon time around 12 years ago?
Answer: Unanswerable

Question: Which calendars were among the last to appear?
Answer: Unanswerable

Question: How long were the original lunisolar calendars?
Answer: Unanswerable

Question: Where did some of the other early forms of months originate?
Answer: Unanswerable

Question: How many seasons were in a year in the original Mayan calendars?
Answer: Unanswerable