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Old 12-01-2007, 05:36 PM   #26
spidey07
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: her209
Quote:
Originally posted by: Jeff7
If it weren't tilted, we'd all be wondering, "Why is Earth's axis so perfectly aligned?"

Planet info

Mercury: 0 degrees
Venus: 3 degrees
Earth: 23.5 degrees
Mars: 25.2 degrees
Jupiter: 3 degrees
Saturn: 27 degrees
Uranus: 98 degrees
Neptune: 29.5 degrees
Pluto: 120 degrees


Just a whole wobbly bunch we've got.
Also, if it weren't tilted, there'd be no seasons.
Not only that, but probably no life. No currents, no winds, no water cycle no nothing.
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Old 12-01-2007, 05:41 PM   #27
gururu2
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: Jeff7
If it weren't tilted, we'd all be wondering, "Why is Earth's axis so perfectly aligned?"

Planet info

Mercury: 0 degrees
Venus: 3 degrees
Earth: 23.5 degrees
Mars: 25.2 degrees
Jupiter: 3 degrees
Saturn: 27 degrees
Uranus: 98 degrees
Neptune: 29.5 degrees
Pluto: 120 degrees


Just a whole wobbly bunch we've got.
the perplexing thing about this is that your anus is also 98 degrees... fahrenheit
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Old 12-01-2007, 05:43 PM   #28
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: Eli
Quote:
Originally posted by: zephyrprime
Quote:
Originally posted by: Jeff7
If it weren't tilted, we'd all be wondering, "Why is Earth's axis so perfectly aligned?"
Not so. All the planets in this solar system are formed form the same cloud of gas. Since it's one cloud, all it's parts have the same axis of rotation so all the planets should pretty close to perfectly aligned with each other and the sun if no collisions or stuff ever happened. The solar system itself is somewhat off kilter to the plane of the galaxy.

I'll have to go with too. Then we'd wonder, "Why wasn't Earth whacked with various objects when it was forming?" Zephr, I think you missed the point of what I meant with my commentary.




Quote:
Originally posted by: spidey07
Quote:
Originally posted by: her209
Quote:
Originally posted by: Jeff7
If it weren't tilted, we'd all be wondering, "Why is Earth's axis so perfectly aligned?"

Planet info

Mercury: 0 degrees
Venus: 3 degrees
Earth: 23.5 degrees
Mars: 25.2 degrees
Jupiter: 3 degrees
Saturn: 27 degrees
Uranus: 98 degrees
Neptune: 29.5 degrees
Pluto: 120 degrees


Just a whole wobbly bunch we've got.
Also, if it weren't tilted, there'd be no seasons.
Not only that, but probably no life. No currents, no winds, no water cycle no nothing.
Check out Venus sometime. Or Jupiter. Very low angles of tilt. Jupiter's got an incredibly turbulent atmosphere, with many long-lived storms, and it's even farther from the Sun than Earth - so less energy input. Venus has low-level breezes on the surface, and windspeeds of a few hundred mph at the cloud tops.

Maybe not life like we have right now, but something would likely arise to take advantage of the benefits of a lack of seasons.
There'd be thermal inequalities anyway just from the uneven heating resulting from the changes in light's angle of incidence, simply due to the shape of a sphere. And Earth rotates - part of it cools, while part heats up. There would still be a constant attempt by the planet to reach thermal equilibrium, resulting in turbulence, and thus, wind and other fluidic currents.
Even the simple action of heating the surface would induce air movement, as the warm surface air rises, only to cool and sink again.
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Old 12-01-2007, 06:10 PM   #29
Shawn
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: spidey07
Quote:
Originally posted by: her209
Quote:
Originally posted by: Jeff7
If it weren't tilted, we'd all be wondering, "Why is Earth's axis so perfectly aligned?"

Planet info

Mercury: 0 degrees
Venus: 3 degrees
Earth: 23.5 degrees
Mars: 25.2 degrees
Jupiter: 3 degrees
Saturn: 27 degrees
Uranus: 98 degrees
Neptune: 29.5 degrees
Pluto: 120 degrees


Just a whole wobbly bunch we've got.
Also, if it weren't tilted, there'd be no seasons.
Not only that, but probably no life. No currents, no winds, no water cycle no nothing.
There would still be life. Currents and winds and the water cycle would still occur because of the earth is spinning. Things would be very different though.
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Old 12-01-2007, 06:16 PM   #30
Fritzo
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: Shawn
Quote:
Originally posted by: spidey07
Quote:
Originally posted by: her209
Quote:
Originally posted by: Jeff7
If it weren't tilted, we'd all be wondering, "Why is Earth's axis so perfectly aligned?"

Planet info

Mercury: 0 degrees
Venus: 3 degrees
Earth: 23.5 degrees
Mars: 25.2 degrees
Jupiter: 3 degrees
Saturn: 27 degrees
Uranus: 98 degrees
Neptune: 29.5 degrees
Pluto: 120 degrees


Just a whole wobbly bunch we've got.
Also, if it weren't tilted, there'd be no seasons.
Not only that, but probably no life. No currents, no winds, no water cycle no nothing.
There would still be life. Currents and winds and the water cycle would still occur because of the earth is spinning. Things would be very different though.
You're a little off there. Currents and winds are mostly caused by the sun's radiation. Tides (and to a point currents) and caused by the moon's pull. Tidal forces are seen as having the greatest impact on the creation and evolution of life.
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Old 12-01-2007, 06:24 PM   #31
gururu2
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: Fritzo

You're a little off there. Currents and winds are mostly caused by the sun's radiation. Tides (and to a point currents) and caused by the moon's pull. Tidal forces are seen as having the greatest impact on the creation and evolution of life.
convection and gravity. winds and currents are very affected by the earths rotation otherwise the sun would only hit one spot of the earth... ever, leading to vast differences in water and air movement. this evolution of life business is just theory, I wouldnt use it to argue on it being dependent on earth rotation, tidal shifts, God's mood, symmetry of the universe, etc.

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Old 12-01-2007, 06:27 PM   #32
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: gururu2
is it fixed at that angle or is slowly changing in either direction? it would seem that since the earth is cooling and becoming less amorphous that it would not hold that angle permanently over eons.
It is changing. Currently, the angle is decreasing (>40,000 year period, 22.1 to 24.5 range)

As the moon moves away (it is moving away from earth ~ 1 inch/year), the earth will lose the buffering effect of the moon's mass (keeps the angle tilt range narrow) so in ~ 2billion years, the tilt range will grow to a much wider ~ 27 and 60 for the period.
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Old 12-01-2007, 06:39 PM   #33
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: nakedfrog
Quote:
Originally posted by: Random Variable
Quote:
Originally posted by: Shawn
probably due to a huge moon sized meteor hitting the earth early on... the same one that caused a piece of the earth to break off creating the moon.
So it's bacially just a theory, not something that could be explained mathematically.
You mean theory in the colloquial sense, and not the scientific? I imagine the proponents of that theory have mathematics to back them up.
There is plenty of math to back it up, many simulations have been done. Most people just don't realize that Planetary Science is a real field with scientists actually working on problems like this one.

Many planets have some sort of tilt. Angular momentum is a conserved quantity, and when several masses are clumped together to form a planet the sum of their angular momentum is also conserved (you basically add them all up and get a new vector). The Earth most likely always had a tilt.
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Old 12-01-2007, 06:43 PM   #34
Eeezee
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: her209
Quote:
Originally posted by: Jeff7
If it weren't tilted, we'd all be wondering, "Why is Earth's axis so perfectly aligned?"

Planet info

Mercury: 0 degrees
Venus: 3 degrees
Earth: 23.5 degrees
Mars: 25.2 degrees
Jupiter: 3 degrees
Saturn: 27 degrees
Uranus: 98 degrees
Neptune: 29.5 degrees
Pluto: 120 degrees


Just a whole wobbly bunch we've got.
Also, if it weren't tilted, there'd be no seasons.
There would likely still be seasons, just not as we know them. The temperature variance from the middle of the year to the beginning might be a few degrees at the most, since the Earth doesn't move in a perfectly circular orbit (it's just barely an ellipse, I know you know this but other ATOTers might not).
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the army of children its carrying on its back will overtake your zoo of domestic animals and destroy you.
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Old 12-01-2007, 06:45 PM   #35
Eeezee
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: gururu2
is it fixed at that angle or is slowly changing in either direction? it would seem that since the earth is cooling and becoming less amorphous that it would not hold that angle permanently over eons.
Does a change of temperature of an object influence its angular momentum? I'm pretty sure it doesn't (or if it does, it's negligible).
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Old 12-01-2007, 06:51 PM   #36
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Pff, that's just the Earth gangsta leaning it's way around the sun.
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Old 12-01-2007, 07:00 PM   #37
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: Shawn
probably due to a huge moon sized meteor hitting the earth early on... the same one that caused a piece of the earth to break off creating the moon.
No no no, it's because God made it that way. There is no reason to question or research any further because of this known truth.
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Old 12-01-2007, 11:11 PM   #38
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

Quote:
Originally posted by: JulesMaximus
Quote:
Originally posted by: Shawn
probably due to a huge moon sized meteor hitting the earth early on... the same one that caused a piece of the earth to break off creating the moon.
No no no, it's because God made it that way. There is no reason to question or research any further because of this known truth.
No, God made Earth with its axis perfectly straight up and down. It's the rest of the Universe that's inclined.
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Old 12-01-2007, 11:29 PM   #39
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Default Why is the Earth's axis inclined 23.5 degrees from the perpendicular to the ecliptic plane?

prolly because of Chuck Norris' Roundhouse kick
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