Insane perspective!

[Lenmcharristar 9,906]

2 minutes ago, Jonjon79 said:

Keep going Len, we'll make an airgunner of you yet

i just find it intresting, and would like to see how the equations are calculated

[Born Hunter 17,812]

5 minutes ago, Lenmcharristar said:

so really a spirit level over that distance is 240 m off the level???  where as a laser that supposedly is straight if it were in the centre of the atlantic ans swithced on at sea level should be 240 m higher at both sides?

Like i said im not sure about crossing the atlantic. But with my little canoeing lake, then yes the water curves making the middle look 12cm higher than either end. As you say you could use a laser, or simply light, to prove it.

[mushroom 13,254]

Someone is using calculus and I'm guessing radii intersection geometry 

Edited September 5, 2018 by mushroom

[Lenmcharristar 9,906]

1 minute ago, Born Hunter said:

Like i said im not sure about crossing the atlantic. But with my little canoeing lake, then yes the water curves making the middle look 12cm higher than either end. As you say you could use a laser, or simply light, to prove it.

defo an experiment id like to try to see how close it is, with the lake obviously haha. 

[Born Hunter 17,812]

6 minutes ago, Lenmcharristar said:

i just find it intresting, and would like to see how the equations are calculated

Here's a calculator from the net. https://dizzib.github.io/earth/curve-calc/?d0=5000&h0=473000&unit=metric

NYC is 5000km away and you need to get h0 to equal h1, then that is ypur height difference. Try 473000m! The maths isn't linear like you were treating it and ive not got it to hand but that website basically does it.

[Born Hunter 17,812]

18 minutes ago, maxhardcore said:

Some facts can be twisted and used to suit any agenda .

That what you posted up could make folk think that there is room for tens of billions more folk on this planet when In Fact the Planet is at a tipping point because of human wanton  destruction

Mate this isn't about politics, just interesting facts. I'll be the first to tell folks were progressing into a shit storm if we don't get aware. You're absolutely right though, but then that is why that first fact is so interesting I think. It's counter intuitive and then makes you think just how much of the Earths surface we are using considering how little we as individuals take up.

[mushroom 13,254]

Found this a good read...

http://tutorial.math.lamar.edu/Classes/CalcIII/Curvature.aspx

There's a problem with finding the curvature between two fixed points on an egg shaped planet though

 

[Lenmcharristar 9,906]

5 minutes ago, Born Hunter said:

Here's a calculator from the net. https://dizzib.github.io/earth/curve-calc/?d0=5000&h0=473000&unit=metric

NYC is 5000km away and you need to get h0 to equal h1, then that is ypur height difference. Try 473000m! The maths isn't linear like you were treating it and ive not got it to hand but that website basically does it.

defo intresting. i see its different because the horizon comes to us before the centre point? 

[Born Hunter 17,812]

23 minutes ago, Lenmcharristar said:

taking into account of the water temp being even with no wind and equal barometric pressure across the distance?

Now you're thinking fella. Yeah wind could push the water about creating a systematic error and thermal gradients can cause light to refract and bend.

In fact when this experiment was done donkeys years ago on a canal the result was that the earth was flat! LOL LOL. The chap hadn't accounted for thermal effect close to the ground. Once he raised his experiment up a bit he avoided that problem.

Edited September 5, 2018 by Born Hunter

[Lenmcharristar 9,906]

1 minute ago, Born Hunter said:

Now you're thinking fella. Yeah wind could push the water about creating a systematic error and thermal gradients can cause light to retract and bend.

In fact when this experiment was done donkeys years ago on a canal the result was that the earth was flat! LOL LOL. The chap hadn't accounted for thermal effect close to the ground. Once he raised his experiment up a bit he avoided that problem.

so the only builders in history to ever have the need for the equations was the great wall of china builders who wouldnt have had a clue about it anyway? haha, better forward those equations to the don just so he gets his wall right and on budget

[mushroom 13,254]

2 minutes ago, Lenmcharristar said:

so the only builders in history to ever have the need for the equations was the great wall of china builders who wouldnt have had a clue about it anyway? haha, better forward those equations to the don just so he gets his wall right and on budget

No mate they did it how we do it now. By working within a smaller section and surveying it that way. The people that really did seem to use this type of calculus and seemed to know a lot about curvature were the Egyptians.

[waltjnr 7,019]

Kerny come back!!! 

[Lenmcharristar 9,906]

3 minutes ago, mushroom said:

No mate they did it how we do it now. By working within a smaller section and surveying it that way. The people that really did seem to use this type of calculus and seemed to know a lot about curvature were the Egyptians.

that was the alien tech that they nicked haha

[Jonjon79 13,358]

29 minutes ago, Lenmcharristar said:

i just find it intresting, and would like to see how the equations are calculated

Aye, same here - some of the equations when people are talking about space, light, time and distance really interest me

....... I just wish I had the brain power to comprehend it properly.

[Lenmcharristar 9,906]

21 minutes ago, Born Hunter said:

Here's a calculator from the net. https://dizzib.github.io/earth/curve-calc/?d0=5000&h0=473000&unit=metric

NYC is 5000km away and you need to get h0 to equal h1, then that is ypur height difference. Try 473000m! The maths isn't linear like you were treating it and ive not got it to hand but that website basically does it.

so we really need to be 472500 m above sea level to see the half way point, over the 5000km distance of the uk to new york in lab conditions. thats what height the light beam will be if switched on at sea level above both sides?