How the Tilt of the earth's Axis is responsible for the seasons?

The Seasons on the Earth's are not caused by the differences in the distance from the sun.As the earth spins on its axis, producing night and day, it also moves about the sun in an elliptical orbit that requires about 365 1/4 days to complete. The earth's spin of axis is tilted with respect to its orbital plane this causes the Seasons.This tilting is what gives us the four seasons of the year - spring, summer, autumn (fall) and winter.

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.