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12/20/2008 10:32:18 AM · #1 |
i was wondering (in north hemi)...
the longest day where the sun is closest to the earth is Jun 21
but the hottest days are in july and aug
samething for dec 21 being the day we farthest from the sun but coldest days are jan-feb
anyone know.? |
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12/20/2008 10:39:52 AM · #2 |
It's all in the tilt my friend. :D
I can't wait for Dec. 21st, days start getting longer. Getting off from work when it's dark at 4:30PM is depressing.
Message edited by author 2008-12-20 10:44:55. |
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12/20/2008 10:44:39 AM · #3 |
The length of day depends only on the earth's axial tilt. Days are longer near the summer solstice (June) in the northern hemisphere, etc.
The distance from the earth to the sun is a function of the elliptical shape of earth's orbit and has nothing to do with the seasons. |
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12/20/2008 11:02:32 AM · #4 |
i know its the tilt, and jun 21 is when we are tilted in a way closest to the sun.
so why then is it not the hottest days of the year then |
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12/20/2008 11:04:43 AM · #5 |
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12/20/2008 11:11:39 AM · #6 |
Like  Jacsaid, it's all in the tilt of the planet. Think of sun rays like a hot shot of rifle pellets. If you're being shot at by a gun, a slight variation in distance from the gun won't help you nearly as much as laying down, so there is less surface area on your body to get hit. The sun has a clean shot at the parts of the Earth that are directly facing it and they will get a more concentrated shot of pellets in the summer when the sun is more overhead. In the winter, however, the sun's shots are hitting the atmosphere at an angle which makes for less concentrated spread, and hence, less heat.
(here's another explanation) |
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12/20/2008 11:21:14 AM · #7 |
Originally posted by kolasi:
i know its the tilt, and jun 21 is when we are tilted in a way closest to the sun.
so why then is it not the hottest days of the year then |
Think of a bathtub. If it's too cool you can put in some very hot water, but it will take a while to change the whole tub. The Earth's atmosphere is much more complex than that, so don't expect a direct correlation between adding energy from the sun and feeling it on the ground. |
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12/21/2008 04:12:35 AM · #8 |
bingo, thats what I was wondering about.
I do realize that its colder in the winter cause you are tilted further away. |
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12/21/2008 04:36:08 AM · #9 |
Originally posted by Jac:
I can't wait for Dec. 21st, days start getting longer. Getting off from work when it's dark at 4:30PM is depressing. |
I'm totally with you about looking forward to the days getting longer again. Right now, where I am living sunrise is around 9.45am and sunset 3.00 pm, so not much daylight at all. |
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12/21/2008 05:22:06 AM · #10 |
The air temperature over land has a lot to do with the ocean temperature. The oceans warm up gradually during the summer months which leads to the gradual overall increase in temperature as summer goes on. That is why the hottest months are well after the longest day, because the oceans are still warming at that point and will continue to warm for some months.
The same is also true as to why the coldest months come after the shortest days. The oceans are still cooling down from the summer heat and will reach their coldest point closer to the end of winter before they begin warming again for summer. |
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12/21/2008 12:27:33 PM · #11 |
Originally posted by salmiakki:
Originally posted by Jac:
I can't wait for Dec. 21st, days start getting longer. Getting off from work when it's dark at 4:30PM is depressing. |
I'm totally with you about looking forward to the days getting longer again. Right now, where I am living sunrise is around 9.45am and sunset 3.00 pm, so not much daylight at all. |
lol...now you see the questions i dwell upon living up north :) |
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12/21/2008 04:27:59 PM · #12 |
| It's dark when I go to work. It's dark when I leave. I have no windows... |
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12/21/2008 04:35:04 PM · #13 |
how do you get your car home ?
Originally posted by Spazmo99:
It's dark when I go to work. It's dark when I leave. I have no windows...
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