However, I can explain the concept in detail.

Tilt of the Earth's Axis:
The Earth's axis is an imaginary line that runs through the North and South Poles. The Earth is tilted on its axis at an angle of approximately 23.5 degrees. This tilt remains constant throughout the year. This tilt is responsible for the changing seasons as different parts of the Earth receive varying amounts of sunlight.

Revolution around the Sun:
The Earth revolves around the Sun in an elliptical orbit. It takes approximately 365.25 days (or one year) to complete one revolution. During its revolution, the Earth is tilted at the same angle, causing different parts of the Earth to be tilted towards or away from the Sun at different times of the year.

Key Points:
- When the Northern Hemisphere is tilted towards the Sun, it experiences summer, while the Southern Hemisphere experiences winter.
- As the Earth continues its revolution, the tilt remains the same, but the orientation changes. This means that the seasons in the Northern and Southern Hemispheres are opposite to each other.
- When the tilt is neither towards nor away from the Sun, the Earth experiences spring or autumn, depending on the hemisphere.
- During spring and autumn, the tilt is such that both hemispheres receive an equal amount of sunlight. This results in milder temperatures compared to summer and winter.

Conclusion:
In conclusion, the occurrence of seasons is a result of the Earth's tilt on its axis and its revolution around the Sun. The tilt causes different parts of the Earth to receive varying amounts of sunlight, resulting in the four seasons we experience.