Horizons What is a negative rotational period?
- Thread starter Crunchy_to_the_MAX
- Start date
It's quite possible that by coincidence and not the result of tidal action a body could have a rotation the same as it's orbit, but after that the action of tidal locking will keep it the same. You see any body orbiting another body will be affected by tides and it's rotational period will be altered, as will the parents but being a larger body it will be less noticable. But tidal locking doesn't refer to the process of the rotation and orbit synchronising, but once synchronised, by whatever method, it refers to the fact that it will remain that way unless some cosmic cataclysm intervenes.
Zeromancer mentions the poles rotate in the opposite directions.
It is that reason we have so many earthquakes and volcanos.
If the earth got it's act together, it would probably solidify the core.
Just sayin"
Some very interesting info in this thread and please take the amusement for what it is.
I now know that all solar bodies have a north and south pole.
Thanks everybody. especially Para Handy
It is that reason we have so many earthquakes and volcanos.
If the earth got it's act together, it would probably solidify the core.
Just sayin"
Some very interesting info in this thread and please take the amusement for what it is.
I now know that all solar bodies have a north and south pole.
Thanks everybody. especially Para Handy
Take a ball / marble / whatever, hold it between your thumb and forefinger, rotate it - on the thumb it turns one way, on the forefinger it turns opposite - the ball is turning only the one way (it is solid) it is just the direction of travel at the two points look / appear / feel different. So for the Earth say, looking down on the north pole (true north) from space directly above you would see it rotate counter-clockwise - now if you were directly above the south pole it would appear to be rotating clockwise - the Earth is still spinning as one complete body, it is just the view that is different.
Is that any clearer?
EDIT: Now realise that @Mike Reacher was making a joke - apologies for assuming otherwise.
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The heat of the core is determined by several factors, none of them rotation.. The primary factors are of course the conductivity of rock and volume/surface area, a body with a higher volume to surface area ratio will cool more slowly than a smaller body with a lower volume to surface area ratio, this us why Mars no longer has a liquid magma layer even though it wwas formed at the same time as the earth and is similar in composition, although it probably has less of the very heavy elements. around 70% of the earths heat is left over from the formation, some of it from the primordial collision that formed the moon. Other factors include radiometric heating, about 30% of earths interior heat comes from radioactive elements that have sunk to the earths core. The gravitational stress caused by the earth/moon binary system probably contributes a very small amount of heat, probably insignificant compared to the others.
Unless the earth was rotating quite fast in a strong gravitational field then it's rotation wouldn't be a significant heating factor, if at all.
Yes I agree of course.
I must certainly say a stupidity but if there is no bottom, no high, no left, no right in the space, there is really a sense of rotation ?
I guess so. Sun wouldn't rise and go down wothout, no?
Difficult to say.
If there were several senses, it could also do it in every way.
Like Empire of Charles Vth? They say the sun never set in his realm. Maybe because it was tidally locked.Difficult to say.
If there were several senses, it could also do it in every way.
Ye, must have caused a lot of friction skimming around in atmo at high speeds.In this case, it is possible that the global warming is not a novelty.
Well, yes, because rotation applies a force we can measure, whereas motion doesn't. For instance, if we have a rotating body with gravity, at the equator if we were to travel at high speed in the opposite direction of rotation we would measure an increase in gravity due to a lowering of the force trying trying to throw us off the planet, we would become heavier, the opposite would happen if we were to travel at high speed in the direction of rotation, we would increase the force trying to throw us off the planet, thus become lighter.
On a non-rotating body, on the other hand, we would only experience and measure the latter effect, so determining if a body is rotating or not is quite a simple experiment using a moving vehicle and gravimeter. Thus if we can measure it there is a sense of rotation.
As a Frenchman you might like to take notice of this:
Invariable plane - Wikipedia
... as it is built from the work of Laplace. This is the basis on which (most of) "the directions and motions" in a star system are referenced to.
As a Frenchman you might like to take notice of this:
Invariable plane - Wikipedia
en.wikipedia.org
... as it is built from the work of Laplace. This is the basis on which (most of) "the directions and motions" in a star system are referenced to.
With humility, I thank you for your lights.
Oh yes if memory serves uranus has been knocked a few times, the Greeks had a phrase for it - bangello seveno waysio to Sundayo.
I was trying to be funny. Maybe not a good time.
Because Zeromancer was referring to a human standing at both poles. One turns left one turns right.
I was joking about the poles turning separately so the earth would tear in half.
Sorry for silly.