1. The cycle of seasons on Earth is a result of its rotation and revolution around the sun. The rotation creates the daily cycle of day and night, while the revolution leads to the movement of the sun's直射點 between the Tropic of Cancer and the Tropic of Capricorn, causing the four seasons - spring, summer, autumn, and winter.2. The tilt of Earth's axis of rotation relative to its orbital plane, approximately 23.45 degrees, is the primary factor influencing seasonal variations. This tilt causes the sun's直射點 to migrate, leading to seasonal changes in climate across different regions.3. Earth's climate zones can be divided into tropical, temperate, and frigid regions. The tropical zones, close to the equator, experience little seasonal variation and are characterized by distinct wet and dry seasons. The frigid zones, near the poles, remain cold throughout the year with minimal seasonal differences. The temperate zones, located between the tropical and frigid zones, exhibit the most pronounced seasonal changes.4. In the northern hemisphere's temperate regions, the seasons are typically divided, with spring and summer grouped together around the summer solstice (around June 21st), and autumn and winter grouped together around the winter solstice (around December 22nd). This division is based on the changing length of daylight and the corresponding temperature variations, creating a complete seasonal cycle throughout the year.5. The changing seasons not only affect temperature but also influence precipitation levels and the growth of plants, having significant impacts on human life and agricultural practices. By observing seasonal changes, people can schedule agricultural activities effectively, adjust their attire, and appreciate the different beauty each season brings.詳情