The messy history behind the modern calendar

The Gregorian calendar and its division into months like May represent a blend of ancient survival needs and cultural inheritances rather than purely scientific measurements. While listeners question the validity of temperature records tied to "arbitrary" months, Kristen Lippincott, former director of the Royal Observatory at Greenwich, explains that early calendars originated from tracking environmental changes, lunar phases, and stellar positions like the rising of Sirius to ensure community survival. Different civilizations developed unique systems, such as the Mesopotamian base-60 series, the Egyptian decimal calendar, and the Aztec 260-day ritual year. Even the French Revolution’s attempt to create a "rational" decimal calendar was driven by an emotional desire to remove religious influence. Ultimately, our current system persists because it effectively approximates the physical reality of Earth’s rotation and orbit while providing a shared cultural framework for international negotiation and daily life.