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  4. Why is the Earth fatter around the middle?
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Why is the Earth fatter around the middle?

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Offline lightarrow

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Why is the Earth fatter around the middle?
« Reply #20 on: 04/03/2007 12:56:16 »
Quote from: jolly on 03/03/2007 22:11:42
It still looks like an egg to me.
If the shape were much more squashed top to bottom, it would resemble a car's wheel. It's not an egg.
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Offline Soul Surfer

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Why is the Earth fatter around the middle?
« Reply #21 on: 04/03/2007 18:18:59 »
I think that a lot of the dispute about the shape of the earth is linked to the fact that you are not stating clearly the deviations from the "normal" that you are talking about.

The basic shape could be defined as that of an ideal fluid sphere as an oblate spheroid but we all know that the surface relief is a few miles and is clearly not in ideal stability. Variations in density between different land masses and water masses also create gravitiational deviations that have some variation in the broad details of the shape.

However using acccurate ranging and radar on satellites it is possible to measure the general gravitational field and small surface changes on the earth down to fractions of an inch  this includes clearly showing the continental drift.  Some of the changes like this show the effects of very minor earth movements and the weather.
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Offline syhprum

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Why is the Earth fatter around the middle?
« Reply #22 on: 04/03/2007 19:39:28 »
It is quite inconceivable that a blackhole could exist at the centre of the Earth, a tiny one would have evaporated long ago and anything large enough to have a long life would make its presence felt by affecting both the density and the rotational period.
 
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paul.fr

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Why is the Earth fatter around the middle?
« Reply #23 on: 05/03/2007 20:25:00 »
Quote from: jolly on 05/03/2007 20:19:19

well o.k its a spheroid.


No, Since the Earth is in fact flattened slightly at the poles and bulges somewhat at the equator, the geometrical figure used in geodesy to most nearly approximate the shape of the Earth is an ellipsoid of revolution. The ellipsoid of revolution is the figure which would be obtained by rotating an ellipse about its shorter axis. An ellipsoid of revolution describing the figure of the Earth is called a reference ellipsoid.

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paul.fr

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Why is the Earth fatter around the middle?
« Reply #24 on: 05/03/2007 20:31:58 »
Quote from: jolly on 05/03/2007 20:19:19

The earths a boy and the suns a girl. So tiny blackholes make planets and supermassive blackholes make galaxys. You can test it. Weight somthing after you pick it up, eg. Weight an apple, then hold it for 5 mins and weight it again, it will be heavier the secound time. Because it has more energy in it and gets pulled down harder. Its not 'gravity', its a blackhole.




So how do you explain weights and measures. We have ,i think there held in france but colud be wrong, items that are exactly 1 meter long, exactly weight i pound, etc.

All weights and measures are taken from these, and they have not gained any weight. like most if not all of your posts.
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