Author Topic: Superb visibility  (Read 1431 times)

Bigfoot_Mike

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Re: Superb visibility
« Reply #15 on: 14:48:15, 29/09/19 »
    Light does not behave differently when going north rather than south.
Travelling from north to south light will be travelling downhill. Therefore, it will be travelling uphill going north. As the speed of light is a constant, itís frequency will be higher travelling N-S. Higher frequencies will be attenuated more by the atmosphere, so you will be able to see further looking northwards than looking south.  That is just basic physics in cloud cuckoo land.  ;D

ninthace

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Re: Superb visibility
« Reply #16 on: 15:16:49, 29/09/19 »
Travelling from north to south light will be travelling downhill. Therefore, it will be travelling uphill going north. As the speed of light is a constant, itís frequency will be higher travelling N-S. Higher frequencies will be attenuated more by the atmosphere, so you will be able to see further looking northwards than looking south.  That is just basic physics in cloud cuckoo land.  ;D
  What's more, if you stood on Snowdon and faced N, the curvature of light in a gravitational field means that on a clear day you would be able to see the back of your own head if Merrick wasn't in the way!
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Dyffryn Ardudwy

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Re: Superb visibility
« Reply #17 on: 15:56:20, 29/09/19 »
Certainly not the Isle of Man, they are slightly off to your left, and as the crow flies, they are only 66miles from the Great Orme headland, according to a friend who owns a yatch, moored in Conwy marina.
Cumbria is almost straight ahead, due North, and Blackpool is at roughly 2pm on the horizon, and the Isle of Man is roughly at 10.30pm.

The mountains i could see, were way beyond the Isle of Man, and behind Cumbria.

It was one of those perfect weather vistas, right cloud formation, crystal clear clarity after heavy rain, and in late Autumn when the air is getting colder.

davengf

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Re: Superb visibility
« Reply #18 on: 17:01:52, 29/09/19 »
Quick calculation method is


(Ht above sea level in feet x 1.5) = (Square of distance in miles.)


Metric version is



(Ht above sea level in metres x 13) = (Square of distance in kilometres.) Bit harder to do in your head.



 







Strider

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Re: Superb visibility
« Reply #19 on: 19:25:25, 29/09/19 »
Some hopefully helpful links :)

http://viewfinderpanoramas.org/panoramas/WAL/GREAT%20ORME.gif

http://viewfinderpanoramas.org/panoramas/UPL/MERRICK-S.gif

http://viewfinderpanoramas.org/panoramas/WAL/SNOWDON-N.gif

Re. Merrick to Snowdon, as you're looking across the sea you'd want a clear day but cool enough not to have a sea mist, so a crisp winter morning would be best.  Not midday as the sun will be in your eyes by then, and I guess will have warmed up the sea a little too ?

For its modest height, that's quite a view from Great Orme... 103 miles to Slieve Donard.  Again I suspect you'd want a clear but cold day.
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fernman

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Re: Superb visibility
« Reply #20 on: 19:53:10, 29/09/19 »
My two pence worth: On a couple of occasions I've seen what I reckon to be the Wicklow Mountains in Ireland from the northern Carneddau. They were too much to the west to be the Isle of Man.

Davidedgarjones

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Re: Superb visibility
« Reply #21 on: 20:57:49, 04/10/19 »
A few years ago while on the Glyders, I thought I could see Jodrell Bank. But I've never found anyone to confirm that this might be possible.Dave

Strider

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Re: Superb visibility
« Reply #22 on: 23:26:59, 04/10/19 »
Possibly, David.  This suggests it might be visible from Glyder Fach at least, Jodrell Bank would be almost directly in line with Buxton: http://viewfinderpanoramas.org/panoramas/WAL/GLYDERFAWR-N.gif
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Bigfoot_Mike

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Re: Superb visibility
« Reply #23 on: 10:06:40, 05/10/19 »
Possibly, David.  This suggests it might be visible from Glyder Fach at least, Jodrell Bank would be almost directly in line with Buxton: http://viewfinderpanoramas.org/panoramas/WAL/GLYDERFAWR-N.gif
That is an interesting site. I had thought that I could see Ben Nevis from Ben Wyvis in the winter and this seems to confirm that this was possible.

richardh1905

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