Cultural and regional variations: Some cultures use lunisolar calendars, agricultural cycles, or regional definitions (e.g., monsoon season, dry/wet seasons) that do not align with either astronomical or meteorological frameworks.
Thus, two systems exist:
The astronomical seasons are defined by Earth’s 23.5-degree axial tilt and our orbit around the sun. They begin on the four "quarter days" of the year: the two solstices (longest and shortest days) and the two equinoxes (equal day and night). months for the seasons verified
The Science Desk Fact-Check Status: ✅ Verified against astronomical and meteorological standards (NASA, NOAA, Royal Greenwich Observatory) or regional definitions (e.g.