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Flat Earth?


gerrydandridge

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10 minutes ago, Chinahand said:

I'm not really sure why I contribute so much to this thread.  I agree there isn't much point as PGW is mostly a very difficult person to communicate with.  It is interesting seeing him occasionally reply in a more honest way as he did to Gerry's recent posts.

I think there are two main reasons I keep coming back to it - firstly because the horizon is such a bloody obvious thing.  How someone can live on the Rock and pretend the horizon doesn't exist is beyond me - and to then claim there is some mystery that the distance to it varies when the refraction of light in mirages and temperature inversions is so well known.  If the heat of a summer road causes you to see an image of the sky shimmering in front of you is it so odd that the cold sea does the opposite? 

Flat earthers to me have a strange gullibility coupled with an odd stubbornness; why so accepting of nonsense but so unaccepting of education.  That combination does infuriate and challenges the part of me which wants to explain the wonders that science have been able to show us.

The second reason is that it is fun to try to find answers to their unreasonable demands.  Paul has been recently demanding PROOF that the world rotates - there are Foucault's pendula, but as ever Flat Earthers claim all sorts of bogus reasons to reject them, so I remember learning about diurnal aberration and post about that.  My latest discovery is a Bravais pendulum, which I have to admit to thinking is quite wonderful.

 Rather than having a pendulum swing backwards and forwards in an arc through the centre of rotation, send it off in a circle about the centre to create what is called a conical pendulum - the string of the pendulum creates a cone shape:

conpen2.gif

If the string is long enough and the circle small then the small angle approximation means that the time it takes to rotate will be basically constant even as it decays due to air resistance.

Set the pendulum swinging one way and time how long it takes to do 100 rotations, then stop it and set it off the other way.

The time's will be ever so slightly different - about a 10th of a second for a 14m pendulum.  Why?

Because of the rotation of the earth.  

The link above shows you how to use that difference to calculate the earth's period of rotation - which we know from the rotation of the stars in a sidereal day. 

PGW, do you get what a sidereal day is?

I personally think it is wonderful you can do such a simple experiment and by doing some simple maths get a result which agrees with the motion of the stars, but not the sun revolving in the skies above us.

Most knowledgeable people know about a Foucault Pendulum, but I hadn't heard of a Bravais Pendulum until PGW got me sufficiently annoyed with his insistence to be spoon fed for me to go and explore.

I'm really glad I did.  What a wonderful experiment - it has a beautiful elegance, just letting a ball on a wire spin around and measuring a difference in the time of it rotations whether it is spun clockwise or anticlockwise due to the rotation of the earth.

Finding out such things is a genuine pleasure.

As is something like this - an article written in 1913 looking at other experiments to prove the Earth's rotation involving everything from dropping weights off towers and down mines, to Foucault and Bravais.

Fascinating stuff.

 

Queue PGW’s “but where’s your scientific proof” comment.

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1 hour ago, Chinahand said:

I'm not really sure why I contribute so much to this thread.  I agree there isn't much point as PGW is mostly a very difficult person to communicate with.  It is interesting seeing him occasionally reply in a more honest way as he did to Gerry's recent posts.

I think there are two main reasons I keep coming back to it - firstly because the horizon is such a bloody obvious thing.  How someone can live on the Rock and pretend the horizon doesn't exist is beyond me - and to then claim there is some mystery that the distance to it varies when the refraction of light in mirages and temperature inversions is so well known.  If the heat of a summer road causes you to see an image of the sky shimmering in front of you is it so odd that the cold sea does the opposite? 

Flat earthers to me have a strange gullibility coupled with an odd stubbornness; why so accepting of nonsense but so unaccepting of education.  That combination does infuriate and challenges the part of me which wants to explain the wonders that science have been able to show us.

The second reason is that it is fun to try to find answers to their unreasonable demands.  Paul has been recently demanding PROOF that the world rotates - there are Foucault's pendula, but as ever Flat Earthers claim all sorts of bogus reasons to reject them, so I remember learning about diurnal aberration and post about that.  My latest discovery is a Bravais pendulum, which I have to admit to thinking is quite wonderful.

 Rather than having a pendulum swing backwards and forwards in an arc through the centre of rotation, send it off in a circle about the centre to create what is called a conical pendulum - the string of the pendulum creates a cone shape:

conpen2.gif

If the string is long enough and the circle small then the small angle approximation means that the time it takes to rotate will be basically constant even as it decays due to air resistance.

Set the pendulum swinging one way and time how long it takes to do 100 rotations, then stop it and set it off the other way.

The time's will be ever so slightly different - about a 10th of a second for a 14m pendulum.  Why?

Because of the rotation of the earth.  

The link above shows you how to use that difference to calculate the earth's period of rotation - which we know from the rotation of the stars in a sidereal day. 

PGW, do you get what a sidereal day is?

I personally think it is wonderful you can do such a simple experiment and by doing some simple maths get a result which agrees with the motion of the stars, but not the sun revolving in the skies above us.

Most knowledgeable people know about a Foucault Pendulum, but I hadn't heard of a Bravais Pendulum until PGW got me sufficiently annoyed with his insistence to be spoon fed for me to go and explore.

I'm really glad I did.  What a wonderful experiment - it has a beautiful elegance, just letting a ball on a wire spin around and measuring a difference in the time of it rotations whether it is spun clockwise or anticlockwise due to the rotation of the earth.

Finding out such things is a genuine pleasure.

As is something like this - an article written in 1913 looking at other experiments to prove the Earth's rotation involving everything from dropping weights off towers and down mines, to Foucault and Bravais.

Fascinating stuff.

 

fascinating indeed china. it's a combination of your ego and your long held faith based beliefs that brings you here so often.

as i have explained to you on numerous occasions, you are a one dimensional thinker in a 3d whirrled.  a limited conversationalist. 

horizon means parallel or flat, clearly.   please do reveal who exactly it was, that claims the horizon doesn't exist? i do love a good gossip.

nice cartoon by the way, i'm glad to have inspired you to research further into your religious beliefs me arl china

 

 

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11 minutes ago, paul's got wright said:

fascinating indeed china. it's a combination of you ego and your long held faith based beliefs that brings you here so often.

as i have explained to you on numerous occasions, you are  one dimensional thinker in a 3d whirrled.  a limited conversationalist. 

horizon means parallel or flat, clearly.   please do reveal who exactly it was, that claims the horizon doesn't exist? i do ove a good gossip.

nice cartoon by the way, i'm glad to have inspired you to research further into your religious beliefs me arl china

 

 

You seem to be confused between Horizon and Horizontal.

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1 hour ago, Neil Down said:

Queue PGW’s “but where’s your scientific proof” comment.

"When sadness fills your heart, and sorrow hides the longing to be free.

When things go wrong each day, you fix your mind to escape your misery.

Your troubled young life has made you turn, to the neil of death" x

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1 hour ago, Chinahand said:

The second reason is that it is fun to try to find answers to their unreasonable demands.  Paul has been recently demanding PROOF that the world rotates - there are Foucault's pendula, but as ever Flat Earthers claim all sorts of bogus reasons to reject them, so I remember learning about diurnal aberration and post about that.  My latest discovery is a Bravais pendulum, which I have to admit to thinking is quite wonderful.

Great discovery, thanks for posting.  Shows what can emerge from even the most sowiest ear of topics.

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Oh the irony of meeting yet another, current, Ballerkermeen teacher last night! Again, singing my praises! How delightful!

We had a quick pint and a good old chat about my many talents, in particular, but generally just about how i am doing. Then later a close colleague of theirs, sent me best wishes via text. Also very nice of them. The night ended with a chance meeting with a retired psychotherapist who, much to my delight, was also very complimentary towards me. The feeling was mutual and we said our goodbyes, agreeing to meet for pleasure, not business, once again in a couple of weeks. Coincidences hey!

Anyone got any names yet, of those who would testify to me having "a screw loose"?

Or are we to endure another night of fantasy?

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1 hour ago, paul's got wright said:

Oh the irony of meeting yet another, current, Ballerkermeen teacher last night! Again, singing my praises! How delightful!

We had a quick pint and a good old chat about my many talents, in particular, but generally just about how i am doing. Then later a close colleague of theirs, sent me best wishes via text. Also very nice of them. The night ended with a chance meeting with a retired psychotherapist who, much to my delight, was also very complimentary towards me. The feeling was mutual and we said our goodbyes, agreeing to meet for pleasure, not business, once again in a couple of weeks. Coincidences hey!

Anyone got any names yet, of those who would testify to me having "a screw loose"?

Or are we to endure another night of fantasy?

Your "teacher" sent your school photo to me

3c2ea5a5e31ee39e8fc77c990ba5f452--straight-jacket-mental-illness.jpg

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2 hours ago, paul's got wright said:

Oh the irony of meeting yet another, current, Ballerkermeen teacher last night! Again, singing my praises! How delightful!

We had a quick pint and a good old chat about my many talents, in particular, but generally just about how i am doing. Then later a close colleague of theirs, sent me best wishes via text. Also very nice of them. The night ended with a chance meeting with a retired psychotherapist who, much to my delight, was also very complimentary towards me. The feeling was mutual and we said our goodbyes, agreeing to meet for pleasure, not business, once again in a couple of weeks. Coincidences hey!

Anyone got any names yet, of those who would testify to me having "a screw loose"?

Or are we to endure another night of fantasy?

Do you go to the seances often then ?

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21 hours ago, paul's got wright said:

you to research further into your religious beliefs

As has been explained multiple times - you are being presented with ways to collect evidence.  Knowledge based on evidence is the opposite of religious belief.

If you disagree with Professors Babović and Mekić then engage with what they have done - critique their methodology.  They have attempted to explain as clearly as possible how to collect the data they have collected and the way they have analysed it to be able them to predict to within 1.5% the rotation of the earth.

Your inability to distinguish evidence based science from religious beliefs is rather problematic.

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