Occurs around September 21st–24th. The Sun crosses the celestial equator moving southward. Again, day and night are roughly equal globally. This begins astronomical autumn in the north and spring in the south.
The changing seasons have been a subject of interest and observation for humans throughout history. The cyclical pattern of the seasons, with their characteristic weather conditions, temperature fluctuations, and daylight hours, plays a significant role in shaping our environment, influencing agriculture, and impacting human activities. This paper aims to provide an in-depth exploration of the seasons, examining the underlying astronomical and climatic factors that govern their occurrence. when are the seasons
A deeper layer of complexity comes from —a slow, 26,000-year wobble of Earth’s rotational axis, like a spinning top. This means the orientation of the tilt changes relative to the stars and relative to the point of perihelion. Over thousands of years, the date of the solstices relative to Earth's orbit shifts. Occurs around September 21st–24th
