EVERYDAY SCIENCE

Detailed explanation-1: -The vernal, or spring, equinox falls on March 20 or 21, and the autumnal equinox is on September 22 or 23. The seasons in the Northern Hemisphere are the opposite of those in the Southern Hemisphere. This means that in Argentina and Australia, winter begins in June.

Detailed explanation-2: -The autumnal equinox-also called the September equinox-arrived on Thursday, September 22. This date marks the start of fall in the Northern Hemisphere and spring in the Southern Hemisphere.

Detailed explanation-3: -Axial tilt The seasons result from the Earth’s axis of rotation being tilted with respect to its orbital plane by an angle of approximately 23.4 degrees. (This tilt is also known as “obliquity of the ecliptic".) Regardless of the time of year, the northern and southern hemispheres always experience opposite seasons.

Detailed explanation-4: -During the northern hemisphere’s spring and summer, the northern hemisphere is tilted towards the Sun. During the northern hemisphere’s autumn and winter, the northern hemisphere is tilted away from the Sun. During the spring and autumn equinoxes, the Earth is neither tilted towards or away from the Sun.