## The speed of an object on the equator of the earth

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robinson
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### The speed of an object on the equator of the earth

This is an old one. It never goes well, because it makes you have to think, and that is fucking anethama, especially if you already dislike the person posing the conundrum.

It relates to the relativity shit that has raised its ugly head elsewhere, but hey, if you are always here posting and reading this shit, you already know that.

Quick summary: An object on the equator is said to be "moving" at around 1037 mph because the earth rotates once a day and the circumference is about 24,901 miles, and yes the reason the math works out so well is because the 24 hours is based on the complete revolution of the planet, herp derp, but let's make it simple and say 1000 mph

Here's a source so you don't try and impeach what I just wrote
Thus, the surface of the earth at the equator moves at a speed of 460 meters per second--or roughly 1,000 miles per hour.
https://www.scientificamerican.com/arti ... per%20hour

No, that is not true, in fact it is

Complete rubbish

In other words, it is garbage, worthless, and it s complete in it's worthlessness

I realized this quite simply by trying to place a camera in a location to show this. I use astronomy software, which is really fucking cool as shit, and to make a movie (animation really) of anything, you simply have to pick a location for the camera. You can't avoid this, the software has to know where your virtual location is in order to render anything.

And before the pedant shows up, Speed is the rate of motion, or equivalently the rate of change of distance.

Speed is a scalar quantity with dimensions length/time; the equivalent vector quantity to speed is velocity. Speed is measured in the same physical units of measurement as velocity, but does not contain the element of direction that velocity has. Speed is thus the magnitude component of velocity.

To say you are "moving east at 1000 mph" is a velocity measurement, but to have such a measurement, you have to choose a reference point. There is no point that you can choose to get a velocity of 1000 mph eastward, this is due to the laws of physics, as well as the acceleration of a spinning point.

The only possible point to choose would be a rocket or airplane flying 1000 mph west from your location, from which one could say you are moving eastward at that velocity, except it is a curving motion, so the velocity changes rapidly. (acceleration)

Which is why the speed of an object on the equator wouldn't be 1000 mph, but a rapidly changing velocity, until the rocket or airplane reached the opposite side if the earth, at which point it would reverse.

There is quite literally no other place to put a camera, especially to measure a 1000 mph speed.

So no, an object on the equator is not moving at 1000 mph. In fact, it isn't moving at all. Unless your point you measure it from is moving, but even then, you never get a 1000 mph measurement of speed. It's not physically possible.

More to come ...
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Anaxagoras
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### Re: The speed of an object on the equator of the earth

The earth spins relative to the rest of the universe.

We also know this indirectly due to the Coriolis effect.
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Anaxagoras
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### Re: The speed of an object on the equator of the earth

A fool thinks himself to be wise, but a wise man knows himself to be a fool.
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robinson
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### Re: The speed of an object on the equator of the earth

My point, which is sharp and unmistakable, is that the speed of an object on the equator is not 1000 mph, much less "to the east", both of which are official claims/explaining from the experts and smarty pants scientists.

It's just like with the tides, or the heating of re-entry from orbit, where experts and official sources have all these explainings and reasons, which are complete rubbish.

Trying to wrench their minds right is like talking to a brick wall.
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robinson
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### Re: The speed of an object on the equator of the earth

Now of course an ivory tower super intellectual at-the-top-of-the-food-chain scientist is one thing, but even ordinary skeptics and physics oriented peoples have a real problem with understanding relatively simple things, and why the consensus is wrong. And of course global warming, the real and most important danger facing all mankind.
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### Re: The speed of an object on the equator of the earth

What a fucking idiot.
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robinson
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### Re: The speed of an object on the equator of the earth

Since motion is relative, we measure speed and velocity from a reference point. Usually we use the solid ground we are on as the point. But with radar and lasers and cameras we can also measure speed from a moving object, and I am thinking of Trooper Mathews who has a very effective camera/radar system in his Highway Patrol vehicle. Damn you Trooper Mathews, damn you to hell!

But be it speed, or velocity, a point on the equator is never moving at 1000 mph, there is not even a reference point possible to get that figure.

Obviously there is movement, and rotation, only a complete moron would think this is an argument against that.

To realize the practical implications, the original question was about ""if I am at latitude 40 degrees north what would be my speed?" (the answer is to multiply the cosine of the degree latitude times the speed of 1,037.5646.) ... so 40 degrees: 794.80665 mph

But is the earth really moving at that speed? NASA and all the smart people say it is.

Now speed is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction.

And velocity is a vector quantity; it is direction-aware. Velocity is the rate at which the position changes. The average velocity is the displacement or position change (a vector quantity) per time ratio.

OK but displacement from where? What is the point you can measure this amazing speed/velocity of the earth?

There isn't one. Saying there is would be complete rubbish.

If you think there is, what is it?
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robinson
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### Re: The speed of an object on the equator of the earth

You get no points for being an insulting pussbag, or refusing to answer because the question is too dumb for words.
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Moe
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### Re: The speed of an object on the equator of the earth

We ain't gettin' noplace fast!
Why you numbskull! Pick out two!
robinson
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### Re: The speed of an object on the equator of the earth

Evasion noted
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robinson
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### Re: The speed of an object on the equator of the earth

I'm quite willing to change my POV on this. Just tell me where to put the camera, that shows a 1000 mph speed, or velocity.
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Anaxagoras
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### Re: The speed of an object on the equator of the earth

robinson wrote: Tue Oct 13, 2020 11:56 pm I'm quite willing to change my POV on this. Just tell me where to put the camera, that shows a 1000 mph speed, or velocity.
How about the north pole or the south pole?
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robinson
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### Re: The speed of an object on the equator of the earth

Shows no movement at all.
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Hotarubi
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### Re: The speed of an object on the equator of the earth

robinson wrote: Wed Oct 14, 2020 12:06 am Shows no movement at all.
Wrong.

Polar motion.

You lose.
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Anaxagoras
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### Re: The speed of an object on the equator of the earth

robinson wrote: Wed Oct 14, 2020 12:06 am Shows no movement at all.
An experiment:

If you stand up straight, and stretch both arms out straight and horizontal, and spin around, are the tips of your fingers moving at a different velocity than your head?
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robinson
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### Re: The speed of an object on the equator of the earth

Here's the software that allows you (or anyone else) to simply make an animation illustrating the problem.

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Anaxagoras
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### Re: The speed of an object on the equator of the earth

Are you suggesting that the earth doesn't spin on its axis?
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robinson
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### Re: The speed of an object on the equator of the earth

Using the example of your own body, what direction is your hand moving? Let’s say it is moving at 5 miles an hour, based on the time and distance, could you say it is moving at 5 mph to the East? West?

Remember that is the claim about an object on the equator, that it is moving East at 1000 mph

Which is simply not true
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robinson
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### Re: The speed of an object on the equator of the earth

The problem with the hand also explains why from your point of view, it’s not moving at all

The distance from you eye to the hand stays exactly the same

Yet obviously there is movement
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robinson
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### Re: The speed of an object on the equator of the earth

Let’s make it even easier

Instead of you spinning, just hold out you hand over you head, and stand on the equator

Now you can say your hand is moving at 1000 mph
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robinson
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### Re: The speed of an object on the equator of the earth

Climb a tall mountain and now your hand is moving even faster!

Looking down at another person, several miles below, you can say your hand is moving faster than their hand

Hell, even at sea level your hand is moving faster than the speed of sound! It’s actually supersonic!
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Anaxagoras
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### Re: The speed of an object on the equator of the earth

It's not moving to the east, because east is only a direction relative to the surface of the earth, which is a curved surface, but it is moving in a circle around the axis of the earth.
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ceptimus
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### Re: The speed of an object on the equator of the earth

Put the camera on the moon, looking at Earth so that north is up. The camera sees the Earth's equator moving right at 1000 mph at the centre, coming towards the camera on the left hand limb and going away from the camera on the right.

If you're concerned about the velocity due to spin, try working out how fast the whole Earth has to go to get around the sun each year. From memory it's about 85,000 mph.

...and then the whole solar system is orbiting around the Milky Way even faster than that, and our whole galaxy is moving yet faster than that relative to other nearby galaxies...
Rob Lister
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### Re: The speed of an object on the equator of the earth

You guys are wasting your time.
Hotarubi
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### Re: The speed of an object on the equator of the earth

Rob Lister wrote: Wed Oct 14, 2020 7:15 pm You guys are wasting your time.
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robinson
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### Re: The speed of an object on the equator of the earth

ceptimus wrote: Wed Oct 14, 2020 5:32 am Put the camera on the moon, looking at Earth so that north is up. The camera sees the Earth's equator moving
That was my first placement of the camera, which showed that an object on the equator, from the moons POV, isn’t moving East at 1000 mph

But because the moon is moving, it alters the total 24 hour distance as well

Also the moon is not usually over the equator, so that also changes things

But in any case, you don’t get a 1000 mph speed using the moon as the POV
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ceptimus
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### Re: The speed of an object on the equator of the earth

The moon takes about 28 days to orbit so reduces the apparent equator speed by less than 4%. This actually makes the speed closer to 1,000mph, because it's 1,037 mph from more 'stationary' positions such as the sun-earth Lagrange points.
ceptimus
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### Re: The speed of an object on the equator of the earth

Just multiply the equator speed by the cosine of the latitude: cos(45) = sqrt(2)/2, so the speed at that latitude = 1,037 * sqrt(2)/2 = 733 mph.
robinson
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### Re: The speed of an object on the equator of the earth

Anaxagoras wrote: Wed Oct 14, 2020 5:12 am It's not moving to the east, because east is only a direction relative to the surface of the earth, which is a curved surface, but it is moving in a circle around the axis of the earth.
I see you are on board with the first thing NASA has wrong

Now about that 1000 mph thing
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robinson
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### Re: The speed of an object on the equator of the earth

To save time, there is only one POV that allows a 1000 mph measurement, but it is a moving camera position that has incredibly complicated motion, not actually possible in the real world

It also only works for a very limited time frame
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### Re: The speed of an object on the equator of the earth

The flash of light you saw in the sky was not a UFO. Swamp gas from a weather balloon was trapped in a thermal pocket and reflected the light from Venus.
robinson
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### Re: The speed of an object on the equator of the earth

What speed is the camera?
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robinson
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### Re: The speed of an object on the equator of the earth

The real obstacle is, of course, we are used to measuring speed or velocity in reference to the unmoving ground.

If a supersonic aircraft was doing 1000 mph, staying directly over the equator, heading East, nobody would say it was doing 2000 mph heading East

Or if going west, not moving at all. But if we accept that an object on the equator is going 1000 mph heading East, that is exactly the facts of the matter. So our unmoving aircraft headed west at 1000 mph is not moving, in relation to the planet. But of course that isn’t true
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robinson
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### Re: The speed of an object on the equator of the earth

A satellite in a much higher altitude, at just the right speed, over the equator, would be like the camera in the animation above. But the last thing anybody would say, is that it is standing still in relation to the planet. It would be going very very fast, in regards to it’s movement in a very large orbit.

The software I linked to shows just how fast
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### Re: The speed of an object on the equator of the earth

Do you think the earth spins or not? Usually we measure the speed at which it spins in relation to the sun, which gives the result of one full rotation every 24 hours. Divide the circumference of the earth at the equator in miles by 24 and that's the speed at the equator in mph. Relative to the sun, of course.

There's also something called a sidereal day if you want to measure the speed of rotation relative to more distant stars to account for the fact that the earth is orbiting the sun once every 365.25 days. A sidereal day is slightly less than 24 hours.
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robinson
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### Re: The speed of an object on the equator of the earth

Of course the earth is spinning
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ceptimus
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### Re: The speed of an object on the equator of the earth

I remember an interminable discussion on a forum or newsgroup concerning whether the moon rotates around its polar axis *, with respect to Earth.

One group maintained that because the moon always shows its same face to the earth, then it doesn't rotate. The other group argued that the moon rotates exactly once per lunar month - and that it has to do this so that it can always point its same hemisphere at Earth as it goes around its orbit.

The stupid thing was that everyone agreed exactly about the moon's motion - they just enjoyed arguing about the correct form of words to use to describe that motion.

This thread is now occupying the same territory of stupid.

* I assume that the group that said the moon doesn't rotate would argue about the very existence of a moon polar axis - but you know what I mean.
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### Re: The speed of an object on the equator of the earth

robinson wrote: Fri Oct 16, 2020 4:02 am Of course the earth is spinning
Then I guess we agree and I don't really understand what point you were trying to make.
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robinson
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### Re: The speed of an object on the equator of the earth

If you take an orange and jam a stick through it, then hold it out and and you rotate your body 360 degrees, the orange always is in the same relation to you, and you made a complete revolution. Did the orange rotate on it’s axis 360 degrees?
Last edited by robinson on Fri Oct 16, 2020 5:14 pm, edited 1 time in total.
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