EVERYDAY SCIENCE

Detailed explanation-1: -Earth’s tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun’s most direct rays. So, when the North Pole tilts toward the Sun, it’s summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it’s winter in the Northern Hemisphere.

Detailed explanation-2: -As the earth spins on its axis, producing night and day, it also moves about the sun in an elliptical (elongated circle) orbit that requires about 365 1/4 days to complete. The earth’s spin axis is tilted with respect to its orbital plane. This is what causes the seasons.

Detailed explanation-3: -The revolution of the earth causes seasons. The revolution of the earth gives the impression that the sun is moving north and south of the equator. The equator faces the Sun directly on March 21 and September 23. During these two days the day and night are equal throughout the earth.

Detailed explanation-4: -The warmth of direct rays causes spring and then summer in that part of the globe. When the Northern Hemisphere of the Earth is leaning away from the sun, it receives more indirect sunlight. The cooling effects of more indirect sunlight cause autumn and winter.

Detailed explanation-5: -(a) Due to the revolution, the length of days and nights varies at a place at different times of the year. (b) Revolution causes a change of seasons. (c) It helps in the location of Tropic of Cancer and Tropic of Capricorn due to the fact that Sun rays fall vertical here. (d) The altitude of the mid-day Sun changes.