Spring
Explanation
Seasonal changes on Earth are primarily caused by the revolution of the Earth around the Sun and the inclination of the Earth's axis. These factors determine the angle of incidence of solar rays and the duration of daylight at different latitudes throughout the year.
Analysis of the Date (23rd September)
- On 23rd September, the Sun is vertically overhead at the Equator. This position is known as an Equinox.
- During an equinox, the circle of illumination passes through both the North and South Poles, resulting in roughly equal lengths of day and night across the entire globe.
- In the Northern Hemisphere, this date marks the transition from Summer to Winter, known as the Autumnal Equinox (experiencing Autumn).
- Conversely, the Southern Hemisphere is transitioning from Winter to Summer. Therefore, on this date, the Southern Hemisphere experiences Spring (Vernal Equinox).
Key Takeaway
Seasons in the Southern Hemisphere are always opposite to those in the Northern Hemisphere. On 23rd September, while it is Autumn in the North, it is Spring in the South.