Misty Mornings with 2020 vision

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ekjdm14
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Re: Misty Mornings with 2020 vision

Post by ekjdm14 »

My view at 8:59 this morning..... Alarm never went off so were late for school run!
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myglaren
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Re: Misty Mornings with 2020 vision

Post by myglaren »

Do you live in the land of eternal darkness?

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Paul-R
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Re: Misty Mornings with 2020 vision

Post by Paul-R »

A black cat in a coal hole at midnight?

Hell Razor5543
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Re: Misty Mornings with 2020 vision

Post by Hell Razor5543 »

You were looking out your window the morning before the Big Bang was due to occur?

Nope, I have got it.
Spoiler: show
A close up view of inside of the lens cap!
Last edited by Hell Razor5543 on 09 Jan 2020, 15:42, edited 1 time in total.

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mickthemaverick
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Re: Misty Mornings with 2020 vision

Post by mickthemaverick »

I reckon that's copied from my Armageddon post a few weeks ago!! :-D

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myglaren
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Re: Misty Mornings with 2020 vision

Post by myglaren »

A completed one of these?
Jigsaw.jpg
Or this taken to the extreme?
EJV7sx2U4AMAlUN.jpg

ekjdm14
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Re: Misty Mornings with 2020 vision

Post by ekjdm14 »

Haha nothing so complex, simply the back of my eyelids! :( oops, managed to get laddo to school just before half past though!

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white exec
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Re: Misty Mornings with 2020 vision

Post by white exec »

Winched across from POTD, by request...
160.JPG
This is an evening shot from our terrace, out across Torre del Mar bay, with Gibraltar in the distance.

The maximum distance you can normally see to the horizon is 3 miles - from ground level for a 6-footer.
Up where we are (406m above sea level), you can see 24 miles.
Gibraltar is 90 miles away . . . so how can we see it? :dunno:

Usual Big Prizes for the answer


A few more...

Sea mist sweeps in
Zamorano sunset.jpg
DSCF1606.JPG
DSCF2098.JPG
And Spain from underneath...?
DSCF2148.JPG

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mickthemaverick
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Re: Misty Mornings with 2020 vision

Post by mickthemaverick »

white exec wrote:
13 Jan 2020, 11:02

The maximum distance you can normally see to the horizon is 3 miles - from ground level for a 6-footer.
Up where we are (406m above sea level), you can see 24 miles.
Gibraltar is 90 miles away . . . so how can we see it? :dunno:

Usual Big Prizes for the answer
Would it be anything to do with the fact that the Rock is 426m high and the horizon distances are the distance limited by the curvature of the earth but raised objects will be visible from further away? (I can't be bothered to do the sums :-D ) :) but heres a diagram of the principle:
Own work
Own work
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Hell Razor5543
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Re: Misty Mornings with 2020 vision

Post by Hell Razor5543 »

Mirage refraction? Taking the picture from a higher than normal elevation? You are using a drone with a decent camera at a much higher altitude?

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white exec
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Re: Misty Mornings with 2020 vision

Post by white exec »

Mick hits the basic geometry: go higher, and you can see further round the curve.
But that's not the reason.

Mirage? No. It's the real thing.
But on the right track.

Clue: Seeing Gib 90 miles away is only possible near sunset.

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Re: Misty Mornings with 2020 vision

Post by Hell Razor5543 »

A mirage is caused by light bending as it passes through air of differing temperatures. The clue (that it only occurs near sunset) would suggest this is likely. Does it happen more often after hot days? If it does, what could be happening is that the ground has become very hot during the day. As cooler air moves in during the evening it is warmed by the ground, allowing a refraction more parallel to the ground (a normal mirage is where the air is hotter than the ground causing a reflection of the sky to appear on the ground). If this is the case it would explain why Gibraltar can been seen when it is, in fact, too far around the horizon to be seen in normal conditions from that altitude.

If I am right then the air is, in effect, behaving like a fibre optic strand to allow the view of Gibraltar to become visible.

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mickthemaverick
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Re: Misty Mornings with 2020 vision

Post by mickthemaverick »

Does that mean it involves sunlight from a lower level in the west casting the "shadow" up into your eyeline or maybe refracting off the atmosphere?
:)

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white exec
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Re: Misty Mornings with 2020 vision

Post by white exec »

Hell Razor5543 wrote:
13 Jan 2020, 15:53
A mirage is caused by light bending as it passes through air of differing temperatures. The clue (that it only occurs near sunset) would suggest this is likely. Does it happen more often after hot days? If it does, what could be happening is that the ground has become very hot during the day. As cooler air moves in during the evening it is warmed by the ground, allowing a refraction more parallel to the ground (a normal mirage is where the air is hotter than the ground causing a reflection of the sky to appear on the ground). If this is the case it would explain why Gibraltar can been seen when it is, in fact, too far around the horizon to be seen in normal conditions from that altitude.

If I am right then the air is, in effect, behaving like a fibre optic strand to allow the view of Gibraltar to become visible.
Spot on.

As the sun goes down, the air at higher altitudes cools quickly, and is temporarily sitting on top of warmer air near the ground - the warmed ground radiates heat into the air immediately above it.

This means that the air near the ground is less dense (warmer) than the air higher up (colder), and the density graduation behaves just like a lens - it bends the light.

Rather than the "bent stick" effect seen when a pole sticks out of the surface of water, where there is a sudden change of density (at the water-air boundary), the change of density of the air at sunset (after a warm day) is a progressive one - nothing sudden - and so it bends light in a curve.

So, light emanating from Gibraltar towards the observer doesn't go off onto space in a straight line, but is curved downwards by the colder air. In that way, you can "see over the horizon".

Virtual beer tokens! :tgif: \:D/

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Re: Misty Mornings with 2020 vision

Post by mickthemaverick »

Every day's a schoolday!!! :)