Flat earth vs Round Earth directional navigation

Ok, I see well I really was not making much sense back then.

Ok, I see well I really was not making much sense back then.

So, now, can you extract for me how you are currently making sense, and how it relates to the OP?

You'll follow a great circle if you don't turn, not a rhumb line.

Not necessarily.  Great circles, by definition, exactly bisect the RE. 

Quote from: BoatswainsMate on July 16, 2012, 10:32:30 PM

Ok, I see well I really was not making much sense back then.

So, now, can you extract for me how you are currently making sense, and how it relates to the OP?

Can you extract, for me, the last time you navigated a ship or attended training, and if so at wich training center/school.

Quote from: Cat Earth Theory on July 16, 2012, 10:16:55 PM

You'll follow a great circle if you don't turn, not a rhumb line.

Not necessarily.  Great circles, by definition, exactly bisect the RE. 

Mhmmm, which is accomplished by not turning, as you can verify with a ball and a toy car.  Obviously the earth isn't perfectly smooth or round, but you'll still generally follow a great circle path if you somehow never turn.

Quote from: markjo on July 17, 2012, 06:25:42 AM

Quote from: Cat Earth Theory on July 16, 2012, 10:16:55 PM

You'll follow a great circle if you don't turn, not a rhumb line.

Not necessarily.  Great circles, by definition, exactly bisect the RE. 

Mhmmm, which is accomplished by not turning, as you can verify with a ball and a toy car.  Obviously the earth isn't perfectly smooth or round, but you'll still generally follow a great circle path if you somehow never turn.

have you done this? because you shouldnt be able to. in fact im sure you cant.

boaty maybe the conclusion is that sailors and pilots are getting it wrong if the earth is flat. they go the shortest path thinking the earth is a sphere when in actual fact if the earth was flat they would all be mistaken and are missing a trick.

Quote from: Cat Earth Theory on July 17, 2012, 11:27:06 AM

Quote from: markjo on July 17, 2012, 06:25:42 AM

Quote from: Cat Earth Theory on July 16, 2012, 10:16:55 PM

You'll follow a great circle if you don't turn, not a rhumb line.

Not necessarily.  Great circles, by definition, exactly bisect the RE. 

Mhmmm, which is accomplished by not turning, as you can verify with a ball and a toy car.  Obviously the earth isn't perfectly smooth or round, but you'll still generally follow a great circle path if you somehow never turn.

have you done this? because you shouldnt be able to. in fact im sure you cant.

I have, and I'm curious why you think it's impossible.

read my previous posts in this thread

How about you summarize the relevant bits so we can have an actual discussion and find where you went wrong, either in understanding what I wrote or perhaps in some other area.

unless the path you take cuts the sphere exactly in half you will always need to ark the path you take

It looks like you were agreeing with what I was just saying here. 

Are you responding to what I actually wrote or to something else right now?

ok ill try and explain, even though all the information has been discussed in this thread and if you did wish to add to it you should of read it all first. anyway...

as stated if you walk around the pole 20 m away you will walk in a circle and have to turn. this turn is still there although very slight until you reach the equator. only when you bisect the sphere in exactly half will you be able to circumnavigate without turning.

if i am wrong then explain to me why you require to turn at 20 m from the pole but not at 1000 km.

The equator is a great circle, the path 20 m from the north pole isn't.  I'm talking about following the path of a great circle, and in fact said that in my post, so I'm not sure what your objection is.

And thank you for implying that i haven't read the thread.  I have, and what you're writing now makes no sense as a rebuttal to what I was just writing about great circles.

Ok, I see well I really was not making much sense back then.

I would like some clarification on your question before I can continue with this discussion. Perhaps a rephrasing of what you wanted answered?

Quote from: BoatswainsMate on July 16, 2012, 10:32:30 PM

Ok, I see well I really was not making much sense back then.

I would like some clarification on your question before I can continue with this discussion. Perhaps a rephrasing of what you wanted answered?

On a flat disc/plane (referring to the map from the wiki), the reasons for marine navigational corrections, Mercator charts, great circle paths, True headings, and distances fall apart.

My initial questions, and the one that has been answered without regard to the differences between air and sea navigation, was that the path you would have to travel on to complete a track line would cause you to turn. Regardless of your magnetic heading being constant due to the position of magnetic north, your vessel would have to turn.

ok ill try and explain, even though all the information has been discussed in this thread and if you did wish to add to it you should of read it all first. anyway...

as stated if you walk around the pole 20 m away you will walk in a circle and have to turn. this turn is still there although very slight until you reach the equator. only when you bisect the sphere in exactly half will you be able to circumnavigate without turning.

if i am wrong then explain to me why you require to turn at 20 m from the pole but not at 1000 km.

Circumnavigating is not walking in a circle 40m wide. Circumnavigating is going around the circumference (hence, circum) starting at point A, and ending at point A. Not a 40m wide circle by the north pole, or anywhere else.

The equator is a great circle, the path 20 m from the north pole isn't.  I'm talking about following the path of a great circle, and in fact said that in my post, so I'm not sure what your objection is.

And thank you for implying that i haven't read the thread.  I have, and what you're writing now makes no sense as a rebuttal to what I was just writing about great circles.

oh is the diagram bisecting the earth in 2 halves? sorry my bad i didnt realize. i thought it was cutting it by a 3rd. you should of corrected me strait away instead of just arguing about it.   

Quote from: squevil on July 17, 2012, 09:19:18 PM

ok ill try and explain, even though all the information has been discussed in this thread and if you did wish to add to it you should of read it all first. anyway...

as stated if you walk around the pole 20 m away you will walk in a circle and have to turn. this turn is still there although very slight until you reach the equator. only when you bisect the sphere in exactly half will you be able to circumnavigate without turning.

if i am wrong then explain to me why you require to turn at 20 m from the pole but not at 1000 km.

Circumnavigating is not walking in a circle 40m wide. Circumnavigating is going around the circumference (hence, circum) starting at point A, and ending at point A. Not a 40m wide circle by the north pole, or anywhere else.

unless you are bisecting the earth in 2 equal halves the example remains. i highly doubt anybody has EVER done that anyway.


edit; unless they are in orbit perhaps

Or an amateur flying around the world... But seriously. You are always going in a circle anyway. Either you're pitching down (around the equator) or you're turning left/right (90 degrees northern, 270 southern

oh is the diagram bisecting the earth in 2 halves? sorry my bad i didnt realize. i thought it was cutting it by a 3rd. you should of corrected me strait away instead of just arguing about it.

Lol, yes, I should have read your mind, figured out that this is where you were getting confused, and stopped you before you made a fool of yourself.

if you read my previous posts you would of noticed that i already agreed with you. my bad i didnt quite grasp the diagram

I did notice, and even pointed that out.  Stop telling me to read your posts when you're the one who wasn't reading what I was writing 

Quote from: squevil on July 17, 2012, 05:52:49 PM

Quote from: Cat Earth Theory on July 17, 2012, 11:27:06 AM

Quote from: markjo on July 17, 2012, 06:25:42 AM

Quote from: Cat Earth Theory on July 16, 2012, 10:16:55 PM

You'll follow a great circle if you don't turn, not a rhumb line.

Not necessarily.  Great circles, by definition, exactly bisect the RE. 

Mhmmm, which is accomplished by not turning, as you can verify with a ball and a toy car.  Obviously the earth isn't perfectly smooth or round, but you'll still generally follow a great circle path if you somehow never turn.

have you done this? because you shouldnt be able to. in fact im sure you cant.

I have, and I'm curious why you think it's impossible.

i dont think you did notice as this posts clearly shows. i was mistaken in the previous thread as i didnt realise what the diagram was saying. im not going to reply again if all you want to argue about is a misunderstanding.

It's not the misunderstanding itself that bothers me, it's that you misunderstood that I was talking about a great circle, when replying to a post that specifically was talking about great circles, and now you seem to be blaming me for not correcting it sooner.

Your reply was confusing, I asked you if you could explain, and instead of just explaining what you thought was going on, you instead decided to go the rude route and tell me to read your previous posts, which weren't relevant as any sort of rebuttal to what I was saying.

You messed up, that's fine, but it's not my job to analyze every post you've made in the thread to find where you might have possibly gone wrong and explain it to you.  You should be doing that.