Earth's axis is tilted;so the angle at which the sun's rays strike the earth changes from month to month.This causes the changing seasons and variations in daylight length.This is further explained below.
When the northern end of the earth's axis tilts towards the sun,the most direct sunlight falls on the northern hemisphere.The sun reaches the highest angle in the sky there, giving the maximum number of daylight hours and the greatest solar heating.The north pole has 24 hours of daylight and it is summer for the northern hemisphere.At the same time,it will be winter in the southern hemisphere and a six-month night descends on the south pole.
Six months later,the southern tip of the earth's axis tilts towards the sun and the situation is reversed.
Even though November and January represent winter ,as there is a time lag in registering the lowest temperature of the season by the earth's surface,the average temperature seems to be slightly different in both the months.
2007-12-19 05:06:30
·
answer #1
·
answered by Arasan 7
·
0⤊
0⤋
Well there are two contributing factors the tilt of the earth and the position of the earth relative to the sun due to the elliptical nature of the earths orbit.
As the earth travels around the sun the tilt of the earths orbit increases or decreases the amount of time your latitude is exposed to the sun effecting the warming and cooling cycle this is most pronounced at the polar regions, and barely noticeable at the equator.
The Earth orbits in a ellipse around the sun which means at time it's closer tot he sun than other which means it received moderately more heat when it's in closer proximity.
2007-12-19 00:19:57
·
answer #2
·
answered by Brian K² 6
·
0⤊
0⤋
The rotation of Earth around the sun. Also because Earth is tilting on it's axis that causes different hemispheres to be closer or further from the sun.
2007-12-19 00:19:38
·
answer #3
·
answered by GirlsDeadMonster 7
·
0⤊
0⤋
the Earth 'wobbles' rather than spinning perfectly. This means that at certain times of the year parts of the Earth are closer to the sun than others, this means that they receive more solar radiation and therefore get hotter.
This is summer.
The other seasons are caused by differing distances from the sun also.
2007-12-19 00:17:16
·
answer #4
·
answered by mountainpenguin 4
·
0⤊
1⤋
Because the position of the earth as it moves around the sun changes. In the warm months, your part of the world is tipped more toward the sun and in the cold months it is tipped more away from the sun.
2007-12-19 00:16:32
·
answer #5
·
answered by Anonymous
·
0⤊
1⤋
oh thats because chuck Norris is doing push ups
2007-12-19 00:19:47
·
answer #6
·
answered by Carl 2
·
0⤊
1⤋