How many miles is the circumference of the Earth?

guyver01

Lifer
Sep 25, 2000
22,135
5
61
or dont..


The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers).
But, if you measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km). This the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
 

Placer14

Platinum Member
Sep 17, 2001
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Is it longer at the equator because of centrifugal force pushing water outward?
 

CraigRT

Lifer
Jun 16, 2000
31,440
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isn't the circumference something like 16K miles?
I didn't look it up.. but I thought it was something like that.
 

Rob9874

Diamond Member
Nov 7, 1999
3,314
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I thought it was about 24,000 miles in circumference, and spins at 1000 mph. Hence, a 24 hour day.

I'll be damned if you can find it on Google. If you search Earth Circumference, you get ways to measure it as a science project.
 

dugweb

Diamond Member
Oct 17, 2002
3,935
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Originally posted by: Kiyup
You guys should look at Saturn in a telescope if you want a good example of polar flattening.

Or this will work

whats polar flattening?

edit : my bad, i think i figured it out
 

morkinva

Diamond Member
Nov 16, 1999
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Originally posted by: Rob9874
I thought it was about 24,000 miles in circumference, and spins at 1000 mph. Hence, a 24 hour day. I'll be damned if you can find it on Google. If you search Earth Circumference, you get ways to measure it as a science project.

Right - so in that commercial where the guy keeps driving to see sunset after sunset, he's driving faster than 1000 mph
 

dmcowen674

No Lifer
Oct 13, 1999
54,889
47
91
www.alienbabeltech.com
Originally posted by: morkinva
Originally posted by: Rob9874
I thought it was about 24,000 miles in circumference, and spins at 1000 mph. Hence, a 24 hour day. I'll be damned if you can find it on Google. If you search Earth Circumference, you get ways to measure it as a science project.

Right - so in that commercial where the guy keeps driving to see sunset after sunset, he's driving faster than 1000 mph

I think it is closer to 800 MPH which is why we get an extra day every 4 years (Leap Years)
 

Rahminator

Senior member
Oct 11, 2001
726
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0
Originally posted by: Jellomancer
Originally posted by: Placer14
Is it longer at the equator because of centrifugal force pushing water outward?

The "centrifugal force" pushes everything outward.

Maybe if such a force existed in the first place, but it doesn't. There's only centripetal force that pushes stuff inward.
 

Heisenberg

Lifer
Dec 21, 2001
10,621
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Originally posted by: Rahminator
Originally posted by: Jellomancer
Originally posted by: Placer14
Is it longer at the equator because of centrifugal force pushing water outward?

The "centrifugal force" pushes everything outward.

Maybe if such a force existed in the first place, but it doesn't. There's only centripetal force that pushes stuff inward.

There is a centrifugal force which pushes things outward, but it's not technically a real force - it's a pseudoforce. It exists only in a noninertial reference frame. The centripedal force is a real force.
 

SoylentGreen

Diamond Member
Oct 17, 2002
4,698
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Originally posted by: dmcowen674
Originally posted by: morkinva
Originally posted by: Rob9874
I thought it was about 24,000 miles in circumference, and spins at 1000 mph. Hence, a 24 hour day. I'll be damned if you can find it on Google. If you search Earth Circumference, you get ways to measure it as a science project.

Right - so in that commercial where the guy keeps driving to see sunset after sunset, he's driving faster than 1000 mph

I think it is closer to 800 MPH which is why we get an extra day every 4 years (Leap Years)

So our day would be over 30 hours?
Yep it would be made up with the leap day.
rolleye.gif
 

Placer14

Platinum Member
Sep 17, 2001
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Originally posted by: Heisenberg
Originally posted by: Rahminator
Originally posted by: Jellomancer
Originally posted by: Placer14
Is it longer at the equator because of centrifugal force pushing water outward?

The "centrifugal force" pushes everything outward.

Maybe if such a force existed in the first place, but it doesn't. There's only centripetal force that pushes stuff inward.

There is a centrifugal force which pushes things outward, but it's not technically a real force - it's a pseudoforce. It exists only in a noninertial reference frame. The centripedal force is a real force.

HA! Welcome to my theoretical world. Population e.
 

WinkOsmosis

Banned
Sep 18, 2002
13,990
1
0
Originally posted by: Heisenberg
Originally posted by: Rahminator
Originally posted by: Jellomancer
Originally posted by: Placer14
Is it longer at the equator because of centrifugal force pushing water outward?

The "centrifugal force" pushes everything outward.

Maybe if such a force existed in the first place, but it doesn't. There's only centripetal force that pushes stuff inward.

There is a centrifugal force which pushes things outward, but it's not technically a real force - it's a pseudoforce. It exists only in a noninertial reference frame. The centripedal force is a real force.

Yes that's why I put it in quotes. Centrifugal force is just the force of mass wanting to keep a straight path.