wikipedia[/url]]The Earth has an axial tilt of about 23° 26’. The axis is tilted in the same direction throughout a year; however, as the Earth orbits the Sun, the hemisphere (half part of earth) tilted away from the Sun will gradually become tilted towards the Sun, and vice versa. This effect is the main cause of the seasons (see effect of sun angle on climate). Whichever hemisphere is currently tilted toward the Sun experiences more hours of sunlight each day, and the sunlight at midday also strikes the ground at an angle nearer the vertical and thus delivers more heat.
Or in other words, the earth's tilt causes the seasons and variations in the distance from the sun don't have a significant effect.
(Wikipedia's content is generally
not copyrighted, and it's pretty useful for school stuff.
)
