Question

why do we have different seasons on the earth ? ​

Answer 1

Answer:

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. When the earth's axis points towards the sun, it is summer for that hemisphere. When the earth's axis points away, winter can be expected. Since the tilt of the axis is 23 1/2 degrees, the North Pole never points directly at the Sun, but on the summer solstice it points as close as it can, and on the winter solstice as far as it can. Midway between these two times, in spring and autumn, the spin axis of the earth points 90 degrees away from the sun. This means that on this date, day and night have about the same length: 12 hours each, more or less.

Answer 2

Answer:

• The seasons on Earth are caused by the tilt of the planet's axis.
• The seasons are caused by Earth's tilted axis. Different regions of the Earth are exposed to the Sun's strongest rays at various times of the year. Therefore, the Northern Hemisphere experiences summer when the North Pole tilts toward the Sun. The Northern Hemisphere also experiences winter during the South Pole's tilt toward the Sun.

• The spin axis of the earth is inclined to its orbital plane. This triggers the change of the seasons. When the axis of the earth faces the sun, it is summer there. When the axis of the globe is facing away, winter is to be expected.
• The imaginary pole known as the Earth's axis traverses the globe's center from "top" to "bottom." One full rotation of the earth around this pole occurs every day. Because of this, there are day and night, with portions of both occurring in every region of the Earth's surface.