Seasonal changes have had a big impact on how different cultures keep track of time. They often looked to nature for guidance.

1. Ancient Civilizations:

   • The Egyptians made a calendar with 365 days. They based it on the flooding of the Nile River. Their year had 12 months, each with 30 days, plus 5 extra days.
   • The Mayans had a very detailed calendar system. One part had 365 days (called Haab) and another had 260 days (called Tzolk'in). This helped them plan for farming and ceremonies.

2. Solar and Lunar Cycles:

   • Many cultures created months based on the moon's cycle, which is about 29.5 days long. This led to a total of around 354 days in lunar calendars.
   • The Islamic calendar follows only the moon, which means its year is about 10-12 days shorter. This causes the months to shift earlier each year.

3. Cultural Variations:

   • Festivals tied to the seasons, like winter solstice celebrations, were often planned around important natural events, like harvest time. This strongly influenced local calendars.

These changes show how different cultures have closely connected their ways of keeping time with the changes in nature around them.