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smokeyd smokeyd
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11 years ago
I need around 3 reasons...

Would the tilt of the Earth be one reason? Since the Northern Hemisphere is tilted away?

Is the atmosphere another reason?

I need more reasons. And please explain them to me! Thanks!
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wrote...
#1
11 years ago
You're right.  Because the northern hemisphere is tilted away from the sun, that is why there is winter in January.  That's the only reason I know about.
wrote...
#2
11 years ago
The only reason you need is the tilt of the earth.  When the earth is tilted away from the sun, then that hemisphere will receieve less light per square meter.  Less light also means less energy, so it is colder. . .
wrote...
#3
11 years ago
The difference in distance to the sun is insignificant compared to the angle of the sun's rays on the earth.  In summer (northern hemisphere), the sun's rays strike more nearly at a right angle to the northern hemisphere, heating the ground more, and causing warmer temperatures.  In effect the sun's energy isn't diluted by hitting the earth at a low angle, and spreading out the energy over a large area.  During northern hemisphere winter the energy of the sun is spread out over a larger area (because the northern hemisphere is tilted away from the sun), so energy per area is less.  Hence, colder temperatures.
wrote...
#4
11 years ago
Reason 1:  The tilt of the earth's axis.  The sun's heat reaching the earth in the northern hemisphere is coming in at a shallow angle.  It is much less direct than in the summer.

Reason 2:  Since it gets colder because of less light in winter, there is a lot of snow.  In the northern hemisphere, there is much more land than the southern hemisphere.  With such a large amount of snow cover, the light and heat is reflected by the snow back out into space.

Reason 3:  The southern hemisphere has a lot of water.  During the summer, the heat from the sun causes water to evaporate and create clouds.  Clouds are excellent at reflecting radiation.  This cloud cover helps to direct the heat back out into space.

But overall, the distance between the Earth and sun is quite insignificant to have much of an effect on global temperatures.
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irinairina
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#5
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11 years ago
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wrote...
#6
11 years ago
Nothing to do with distance from the sun - the amounts are too tiny.

The tilt of the Earth causes the sun to rise higher in the sky in summer and lower in winter.  

it is exactly the same effect on a longer timescale as the difference between the sun in the early morning and the sun at midday.  

1.  the sun shines through more atmosphere in winter (also ealry and later in the day)
2.  the sun's light is more spread out when the sun is lower in the sky - shine a flashlight straight down and then the ground 10 meters in front of you and see the difference in intensity.
3.  The hemisphere in summer experiences a longer daylight period (more time to heat up, and less night to cool down), going to extremes at the poles, where they have 6 months daylight in summer and six months night in winter.
wrote...
#7
11 years ago
Hi,The  Earth's axis of rotation is not perpendicular to the plane of its orbit around the Sun.When the Sun is directly over the Equator,the Earth is not inclined.As the Earth starts to tilt upward the Sun appears to move down away from the Equator until it is directly over the Tropic of Capricorn (23.5degrees south).which is farthest from the Equator.This is when the Northern Hemisphere experience Winter (winter solstice) and the Southern Hemisphere is in Summer. The Earth stops then starts to tilt down over the Equator,while the Sun appears to move north until it is over the Tropic of Cancer.(23.5degrees north) which is farthest from the Equator.

This is what gives us our 4 seasons .One full tilt up followed by one full tilt down. So when the Sun is over the Equator day and night have the same number of hours (Equinox)Which is Spring and Autumn.and when it is over the Tropic of Cancer and over the Tropic of Capricorn we have the summer and winter Solstice.
I hope i have made some sense of this for you. Cheers
wrote...
#8
11 years ago
I hope no teacher asked you to give three reasons.  There is only one.  It is the tilt, as others have stated.  (Declination of the earth's polar axis to the plane of the ecliptic.)
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