Using a telescope to see across the planet,
« on: December 04, 2018, 01:36:19 AM »
Hi, so I have a question, if the earth is flat why can I not stand on Australia and with a telescope see the uk? Hypertheticaly speaking there is no mountain ranges or natural barriers in the way. If your theory was correct then this would be possible

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Offline rabinoz

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Re: Using a telescope to see across the planet,
« Reply #1 on: December 04, 2018, 02:09:16 AM »
Hi, so I have a question, if the earth is flat why can I not stand on Australia and with a telescope see the uk? Hypertheticaly speaking there is no mountain ranges or natural barriers in the way. If your theory was correct then this would be possible
Even through the cleanest air there is quite finite visibility distance.
Hence, whether the earth is flat or not you see more than a few hundred kilometres due to the Scattering of light in the air.
Quote from: Wikipedia
Visibility
In extremely clean air in Arctic or mountainous areas, the visibility can be up to 160 km (100 miles) where there are large markers such as mountains or high ridges. However, visibility is often reduced somewhat by air pollution and high humidity.

Visibility distance is of vital importance for aircraft pilots and this article treats that side: Introduction to atmospheric visibility estimation by Alec Bennett

Re: Using a telescope to see across the planet,
« Reply #2 on: December 05, 2018, 11:14:53 AM »
Hi, so I have a question, if the earth is flat why can I not stand on Australia and with a telescope see the uk? Hypertheticaly speaking there is no mountain ranges or natural barriers in the way. If your theory was correct then this would be possible
How do you conclude there are no mountain ranges in the line of sight?

How do you conclude the weather is a constant from your point of observation throughout the distance to the object being observed?

Re: Using a telescope to see across the planet,
« Reply #3 on: December 05, 2018, 12:00:54 PM »
I have quite a lot of experience with telescopes having been an amateur astronomer for over 35 years. Obviously distance and line of sight is not an issue because I can see the mountains and craters of the Moon through any telescope from my garden.

What does limit how far and how clearly you can see directly over land is the state of the air between you and the target of interest. At my local nature reserve a bird that is a few metres away is clear and sharp but a building way off near the horizon is shimmering and blurred due to air turbulence. If the air were to cool and stablise the view would improve. As well as air stability, light scattering by the atmosphere comes into play as well. You have probably noticed how the clarity of the landscape gets increasingly hazy with distance even during colder weather when the air is more stable.

Land is a much better conductor of heat than water so it heats up much quicker. That is evident from the mirages and shimmering you see in the distance along a road where the surface has been heated by the Sun.  Seeing conditions over distance at sea will generally be better than the same distance would be over land. 


So going back to my initial point about distance.  If you ignored the effects of air turbulence and refraction over such a large distance as Australia from the UK AND the UK was in a direct line of sight (assuming flat and no other obstacles in the way) then yes a telescope would show the UK. However add the effects of air turbulence and light scattering back into the equation and there is no way it would work even if the surface was completely flat.  In reality it doesn't work for another very good reason but I will let you figure that one out!
« Last Edit: December 05, 2018, 12:10:59 PM by LoveScience »

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Offline Venus

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Re: Using a telescope to see across the planet,
« Reply #4 on: Today at 03:01:17 AM »
Hi, so I have a question, if the earth is flat why can I not stand on Australia and with a telescope see the uk? Hypertheticaly speaking there is no mountain ranges or natural barriers in the way. If your theory was correct then this would be possible

Obviously Australia to UK is a huge distance... but it should be possible to see the multi storey buildings along the coast of West Palm Beach (in Florida) from Myrtle Beach (North Carolina) a distance of 500km with a telescope on a clear day ... IF the earth was flat!! Any takers??
Because I live on the 'bottom' of a spinning spherical earth ...
*I cannot see Polaris, but I can see the Southern Cross
*When I look at the stars they appear to rotate clockwise, not anti-clockwise
*I see the moon 'upside down'
I've travelled to the Northern Hemisphere numerous times ... and seen how different the stars and the moon are 'up' there!
Come on down and check it out FE believers... !!