Rhumb Lines and Great Circles

  • 64 Replies
  • 12943 Views
*

Trekky0623

  • Official Member
  • 10061
Re: Rhumb Lines and Great Circles
« Reply #30 on: August 01, 2007, 10:22:14 AM »
East to west are circles on FE, therefore just travel in straight line and there's your rhumb line.


Re: Rhumb Lines and Great Circles
« Reply #31 on: August 01, 2007, 01:20:27 PM »
East to west are circles on FE, therefore just travel in straight line and there's your rhumb line.



Yup.. But these rhumb lines are also geodesics.

I never thought about this before, but going from East to West on FE would require changing your bearing! East-to-West motion is a circle, and rhumb lines are straight lines... This is a rather strange idea, and I haven't yet thought of the implications.

*

narcberry

  • 5623
  • Official Flat Earth Society Spokesman/min
Re: Rhumb Lines and Great Circles
« Reply #32 on: August 01, 2007, 01:21:26 PM »
I'll tell you the implications:

The earth is flat.

Re: Rhumb Lines and Great Circles
« Reply #33 on: August 01, 2007, 01:23:44 PM »
I'll tell you the implications:

The earth is flat.

Please explain why.

Also, please explain why, on a flat Earth, you would have to change direction in order to travel directly East.

*

narcberry

  • 5623
  • Official Flat Earth Society Spokesman/min
Re: Rhumb Lines and Great Circles
« Reply #34 on: August 01, 2007, 01:25:57 PM »
You only have to change directions to maintain an easterly course.

However, you can save time by navigating in a straight line. So if one were to travel from NY to London, they could save miles by starting out on an east by north-east course, and end the journey on a east by south-east course.

*

sokarul

  • 18883
  • Extra Racist
Re: Rhumb Lines and Great Circles
« Reply #35 on: August 01, 2007, 05:11:12 PM »
You only have to change directions to maintain an easterly course.

However, you can save time by navigating in a straight line. So if one were to travel from NY to London, they could save miles by starting out on an east by north-east course, and end the journey on a east by south-east course.
That proves the earth is round. 
ANNIHILATOR OF  SHIFTER

It's no slur if it's fact.

*

Roundy the Truthinessist

  • Flat Earth TheFLAMETHROWER!
  • The Elder Ones
  • 27043
  • I'm the boss.
Re: Rhumb Lines and Great Circles
« Reply #36 on: August 01, 2007, 05:13:06 PM »
No it doesn't.
Where did you educate the biology, in toulet?

*

sokarul

  • 18883
  • Extra Racist
Re: Rhumb Lines and Great Circles
« Reply #37 on: August 01, 2007, 05:41:10 PM »
ANNIHILATOR OF  SHIFTER

It's no slur if it's fact.

*

Roundy the Truthinessist

  • Flat Earth TheFLAMETHROWER!
  • The Elder Ones
  • 27043
  • I'm the boss.
Re: Rhumb Lines and Great Circles
« Reply #38 on: August 01, 2007, 05:46:16 PM »
Where did you educate the biology, in toulet?

*

sokarul

  • 18883
  • Extra Racist
Re: Rhumb Lines and Great Circles
« Reply #39 on: August 01, 2007, 06:33:51 PM »
No it doesn't.
Read it again. 
You read it again.
Ok, two  non continuous lines make a shorter path then one continuous line.  That calls for a round earth. 
ANNIHILATOR OF  SHIFTER

It's no slur if it's fact.

*

CommonCents

  • 1779
  • ^_^
Re: Rhumb Lines and Great Circles
« Reply #40 on: August 01, 2007, 06:44:59 PM »
No it doesn't.
Read it again. 
You read it again.
Ok, two  non continuous lines make a shorter path then one continuous line.  That calls for a round earth. 

That's not what Narcberry said.  He said a single straight line is shorter than a east/west ring.
OMG!

*

sokarul

  • 18883
  • Extra Racist
Re: Rhumb Lines and Great Circles
« Reply #41 on: August 01, 2007, 06:50:12 PM »
You only have to change directions to maintain an easterly course.

However, you can save time by navigating in a straight line. So if one were to travel from NY to London, they could save miles by starting out on an east by north-east course, and end the journey on a east by south-east course.
Yeah I guess I read this wrong.  One a flat earth map, one line could do this. 
ANNIHILATOR OF  SHIFTER

It's no slur if it's fact.

*

Roundy the Truthinessist

  • Flat Earth TheFLAMETHROWER!
  • The Elder Ones
  • 27043
  • I'm the boss.
Re: Rhumb Lines and Great Circles
« Reply #42 on: August 01, 2007, 11:18:57 PM »
AND IT GETS THROUGH!  ;D
Where did you educate the biology, in toulet?

Re: Rhumb Lines and Great Circles
« Reply #43 on: August 02, 2007, 01:18:25 AM »
I'm asking again:

1) Why, on a flat Earth, do you have to constantly change your "bearing" in order to keep a constant Eastwards "bearing"

2) Why, on a flat Earth, do rhumb lines turn out to be geodesics, when in real life, they are not geodesics?

*

CommonCents

  • 1779
  • ^_^
Re: Rhumb Lines and Great Circles
« Reply #44 on: August 02, 2007, 06:22:41 AM »
I'm asking again:

1) Why, on a flat Earth, do you have to constantly change your "bearing" in order to keep a constant Eastwards "bearing"

You don't.  An Eastwards bearing is an Eastwards bearing...nice try at a trick question though.
OMG!

Re: Rhumb Lines and Great Circles
« Reply #45 on: August 02, 2007, 06:56:59 AM »
I'm asking again:

1) Why, on a flat Earth, do you have to constantly change your "bearing" in order to keep a constant Eastwards "bearing"

You don't.  An Eastwards bearing is an Eastwards bearing...nice try at a trick question though.

East-to-West on flat Earth is a circle. Do you agree?

If you agree, then you must change bearings to go East-to-West...

*

CommonCents

  • 1779
  • ^_^
Re: Rhumb Lines and Great Circles
« Reply #46 on: August 02, 2007, 07:40:04 AM »
Re-read what you said and it'll all make sense.
OMG!

*

narcberry

  • 5623
  • Official Flat Earth Society Spokesman/min
Re: Rhumb Lines and Great Circles
« Reply #47 on: August 02, 2007, 07:47:33 AM »
I do not understand what you are trying to say. RE and FE both have to change direction to maintain a heading.

*

CommonCents

  • 1779
  • ^_^
Re: Rhumb Lines and Great Circles
« Reply #48 on: August 02, 2007, 08:24:14 AM »
I do not understand what you are trying to say. RE and FE both have to change direction to maintain a heading.

Yeah, but he said change a 'bearing' to maintain a 'bearing'.  It's such an attempt at a trick question it's not even funny.  It would be different if he said, for instance, "Why do you have to constantly turn left to travel East along the equator?"  Too bad that's been asked before and you can't prove you're not turning left.
OMG!

*

Tom Bishop

  • Flat Earth Believer
  • 17814
Re: Rhumb Lines and Great Circles
« Reply #49 on: August 02, 2007, 09:28:12 AM »
Quote
If you agree, then you must change bearings to go East-to-West...

On a Round Earth we are also curving as we travel East or West.

Consider: Lets say that we are at the North Pole on a Round Earth and have a compass. We are positioned twenty feet from the point of magnetic north and we want to travel East. In order to continue East we must constantly curve around the point of magnetic north.

*

Trekky0623

  • Official Member
  • 10061
Re: Rhumb Lines and Great Circles
« Reply #50 on: August 02, 2007, 09:39:16 AM »
On a round Earth, you must change direction in order to stay on a Rhumb line.  On a Flat Earth you do not.  On a Round earth, you make no corrections in order to go east to west.  On a Flat Earth you do.  See?

*

sokarul

  • 18883
  • Extra Racist
Re: Rhumb Lines and Great Circles
« Reply #51 on: August 02, 2007, 09:51:48 AM »
You guys are missing what he is gettign at.  Look up "bearing". 
ANNIHILATOR OF  SHIFTER

It's no slur if it's fact.

*

CommonCents

  • 1779
  • ^_^
Re: Rhumb Lines and Great Circles
« Reply #52 on: August 02, 2007, 10:19:54 AM »
On a round Earth, you must change direction in order to stay on a Rhumb line.  On a Flat Earth you do not.  On a Round earth, you make no corrections in order to go east to west.  On a Flat Earth you do.  See?

That only holds true at the Equator.
OMG!

*

narcberry

  • 5623
  • Official Flat Earth Society Spokesman/min
Re: Rhumb Lines and Great Circles
« Reply #53 on: August 02, 2007, 10:28:21 AM »
On a round Earth, you must change direction in order to stay on a Rhumb line.  On a Flat Earth you do not.  On a Round earth, you make no corrections in order to go east to west.  On a Flat Earth you do.  See?

2 yards south of the north pole, how long will a straight line allow you to travel directly east?

*

Trekky0623

  • Official Member
  • 10061
Re: Rhumb Lines and Great Circles
« Reply #54 on: August 02, 2007, 11:11:55 AM »
In the Southern Equator, you make opposite adjustments.  How do you explain that?

Re: Rhumb Lines and Great Circles
« Reply #55 on: August 02, 2007, 11:46:15 AM »
I'm asking again:

1) Why, on a flat Earth, do you have to constantly change your "bearing" in order to keep a constant Eastwards "bearing"

You don't.  An Eastwards bearing is an Eastwards bearing...nice try at a trick question though.

Yeah yeah... Okay:
1) Why, on a flat Earth, do you have to constantly change your direction in order to keep a constant Eastwards bearing?

*

Roundy the Truthinessist

  • Flat Earth TheFLAMETHROWER!
  • The Elder Ones
  • 27043
  • I'm the boss.
Re: Rhumb Lines and Great Circles
« Reply #56 on: August 02, 2007, 11:47:43 AM »
I'm no expert, but I'm gonna guess it's because east and west go in circles on a flat earth.  ::)
Where did you educate the biology, in toulet?

Re: Rhumb Lines and Great Circles
« Reply #57 on: August 02, 2007, 11:52:06 AM »
I'm no expert, but I'm gonna guess it's because east and west go in circles on a flat earth.  ::)

That's the point. I'm asking for an explanation.

Anyhow, this point isn't the main point of the thread. The question still remains:

In FE, rhumb lines are always geodesics. In real life, rhumb lines are not always geodesics. Hence, the Earth is not flat.

Can anyone refute this?

*

narcberry

  • 5623
  • Official Flat Earth Society Spokesman/min
Re: Rhumb Lines and Great Circles
« Reply #58 on: August 02, 2007, 11:52:56 AM »
I'm asking again:

1) Why, on a flat Earth, do you have to constantly change your "bearing" in order to keep a constant Eastwards "bearing"

You don't.  An Eastwards bearing is an Eastwards bearing...nice try at a trick question though.

Yeah yeah... Okay:
1) Why, on a flat Earth, do you have to constantly change your direction in order to keep a constant Eastwards bearing?

It's the same for RE...

Re: Rhumb Lines and Great Circles
« Reply #59 on: August 02, 2007, 11:53:43 AM »
I'm asking again:

1) Why, on a flat Earth, do you have to constantly change your "bearing" in order to keep a constant Eastwards "bearing"

You don't.  An Eastwards bearing is an Eastwards bearing...nice try at a trick question though.

Yeah yeah... Okay:
1) Why, on a flat Earth, do you have to constantly change your direction in order to keep a constant Eastwards bearing?

It's the same for RE...

No, it's not. (At least if you think of the Earth's surface as a manifold...)