ramon Posted June 20, 2005 Share Posted June 20, 2005 Wondering about our rate of motion taking into account 1. Rotation of the earth 2. Rotation around the sun 3. Rotation of the Milky Way 4. Expansion of the Universe.Will eventually work this out when I am in a more rational mindset, but figured someone might have already worked it out Quote Link to comment Share on other sites More sharing options...
spaced Posted June 20, 2005 Share Posted June 20, 2005 In relation to what? Its all relative to whatever is deemed to be standing still.To quote Ghandi"Speed is irrelevant if you're travelling in the wrong direction." Quote Link to comment Share on other sites More sharing options...
ramon Posted June 20, 2005 Author Share Posted June 20, 2005 In relation to where we are now.In other words how far have we travelled in 24 Hours. Ignoring local travel. Quote Link to comment Share on other sites More sharing options...
Thelema Posted June 20, 2005 Share Posted June 20, 2005 popeye, you gotta get your head around relative space.you're asking for distance measured absolutely, there's no such thing.eg: how far have you travelled if everything ELSE moves 2km in one direction? an absolutist would say you haven't moved at all, a relativist would say 2km. Like wise for the question youre asking, to ask for distance moved in your case, you must provide a reference point that is regarded at rest, ie v=0. Quote Link to comment Share on other sites More sharing options...
dukes apprentice Posted June 21, 2005 Share Posted June 21, 2005 he did how far have we moved in 24 hours so how far are we away from the point we were at 24 hours ago i think the universe expands at 2000 miles per hourwe (the earth) are stuck in the suns depression it has made in space time and since the sun is so big it takes more energy to propell it so i think it travels a shorter distance then a smaller planet would in 24 hours i think thats right but i am not physasist so dont quote me now as for the actual question i have absolutely no clue as to how far we have traveld in 24 hours but id say its some where in the hundreds of millions of kilometers Quote Link to comment Share on other sites More sharing options...
dukes apprentice Posted June 21, 2005 Share Posted June 21, 2005 sorry to hijack your thread popeye but this is another thing iv allways thought about for an alian being to land on earth and survive its home planet would have to be close to the same size because if it was twice as big then the alian being would be extremly dizzie wouldnt it? since they evolved rotateing at a speed half that of the earths Quote Link to comment Share on other sites More sharing options...
Hagakure Posted June 21, 2005 Share Posted June 21, 2005 but where we were 24 hours ago is still relativeisnt it?duke - seen or read hitchhikers guide to the galaxy - there is a size problem like that in it. the concept has been used in many parody scifi comics aswelldizziness wouldnt be the problem - you can get used to different speeds of rotation but the gravatational pull would be a big issue.they would have machines to sit in like war of the worlds - i think they come from mars in war of the worlds? therefore the aliens are used to less gravity and need machines to move freely. Quote Link to comment Share on other sites More sharing options...
Thelema Posted June 21, 2005 Share Posted June 21, 2005 yeah the point the earth was at 24hours ago did not have a v of 0.the question can only be answered like this:how far has the earth moved in the last 24 hours with reference to itself/the moon/sun/centre of mass of the solar system/centre of the milky way/centre of local supercluster etc etcthe problem is, to say "the point the earth was at" needs you to declare the frame of reference from which you are making that meausrement Quote Link to comment Share on other sites More sharing options...
trixxy3 Posted June 21, 2005 Share Posted June 21, 2005 I've never been sure how expansion of the universe is plausible? Isn't it just another term for the light from that distance of "expansion", which takes what billions of years to reach earth, finally reaching here, after being fractured and refractured, bent, even slowed down or sped up through different gases that may not exist anywhere in our solar system, thus causing the appearance of an expanding universe.And then if the universe is expanding, why are we the center of it, wouldn't we also be getting further away from stars on the other side of the sphere of the universe, and keeping closer distances to the stars that are, at a given time time, the same distance from earth and our sun, but on the same side of the expansion.sorry, bit of a hijack and ramble at that. Quote Link to comment Share on other sites More sharing options...
Salviador Posted June 21, 2005 Share Posted June 21, 2005 I am confused. Doesnt relativity only come into play when were talking high speeds like close to the speed of light? If you get an x y z coordinate at time one and then another at time two you would be able to divide the distance over the time??? i dont quite understand where the relativity comes into it Quote Link to comment Share on other sites More sharing options...
Thelema Posted June 21, 2005 Share Posted June 21, 2005 the concept of relative space is different from the concept of einsteinian "relativity" as set down in the general and special theories of relativity, even tho the latter does use the former.to make this clear, let me say, in the last 24 hours in relation to itself, the earth has not moved. In the last 24 hours in relation to the sun the earth has moved 66 000 km. In relation to the centre of the milky way, the earth has moved XX? kilometers etc. Quote Link to comment Share on other sites More sharing options...
Salviador Posted June 22, 2005 Share Posted June 22, 2005 oh right, thanks thel! Quote Link to comment Share on other sites More sharing options...
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