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Sun (Set & Rise) below horizon  Topic is solved

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Sun (Set & Rise) below horizon

Postby Clive2670 » Wed Apr 19, 2017 6:03 pm

Hi all, This question may have been asked before so I apologise in advance if it has! I noticed the other night on my way to LEMG at FL300 that the sun had "set" but still appeared below the real horizon (sea) I was wondering if anyone was aware of this issue? I will say I'm not overly bothered, I just noticed it and was wondering, As it is only a minor thing in the grand scheme of things
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Re: Sun (Set & Rise) below horizon

Postby Johan G » Wed Apr 19, 2017 7:02 pm

A screenshot would be immensely helpful here. :wink:
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Re: Sun (Set & Rise) below horizon

Postby Thorsten » Thu Apr 20, 2017 5:11 am

The horizon you see from 30.000 ft is usually not the ground but the upper edge of the lowest haze layer, so if the sun is visible 'a little' below the horizon, that's likely okay, if it's 'a lot' then it's likely a bug (though having written the patch to fix that issue a while ago, I dare say the sun can't be a lot below the horizon...).
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Re: Sun (Set & Rise) below horizon

Postby Clive2670 » Thu Apr 20, 2017 5:29 pm

Johan G wrote in Wed Apr 19, 2017 7:02 pm:A screenshot would be immensely helpful here. :wink:

I'll do a shot next time I spot the the issue Johan, How is the best way to post such screen shots on the forum please, as I've encountered issues in the past when I have tried to enter "Screen shot of the month" and just gave up!!
Thanks Clive aka: G-BLS01, BIGJET1
Can be seen flying the Boeing 777-200LR
Toshiba laptop,
Intel i5 4210U,
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AMD R7-M260 graphics 2Gb RAM
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Re: Sun (Set & Rise) below horizon

Postby Clive2670 » Thu Apr 20, 2017 5:33 pm

Thorsten wrote in Thu Apr 20, 2017 5:11 am:The horizon you see from 30.000 ft is usually not the ground but the upper edge of the lowest haze layer, so if the sun is visible 'a little' below the horizon

Thanks for the info Thorsten, I can see where you are coming from with the haze layer, But as I said to Johan, I will post a good screen shot of this, on what happens to me @ FL300 shortly and you can then say if this is normal or too far below the horizon
Thanks Clive aka: G-BLS01, BIGJET1
Can be seen flying the Boeing 777-200LR
Toshiba laptop,
Intel i5 4210U,
16Gb RAM,
AMD R7-M260 graphics 2Gb RAM
User avatar
Clive2670
 
Posts: 577
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Location: Anywhere in the World at some point on Flightgear!
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Re: Sun (Set & Rise) below horizon

Postby Johan G » Thu Apr 20, 2017 6:35 pm

Clive2670 wrote in Thu Apr 20, 2017 5:29 pm:How is the best way to post such screen shots on the forum please [...]

This post is probably of help: FAQ: Screenshots.

When choosing an image host it is important that you can hotlink directly to the image file, which is something that can be tricky at some of them. The forum software need the URL to go straight to the image and not a page with the image for image to be shown on the forum.
Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video)
Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress)
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Re: Sun (Set & Rise) below horizon

Postby Clive2670 » Thu Apr 20, 2017 7:47 pm

Here we go guys hope this helps! Image Approx FL300 above the Atlantic on way to Honolulu
Last edited by Clive2670 on Thu Apr 20, 2017 7:49 pm, edited 1 time in total.
Thanks Clive aka: G-BLS01, BIGJET1
Can be seen flying the Boeing 777-200LR
Toshiba laptop,
Intel i5 4210U,
16Gb RAM,
AMD R7-M260 graphics 2Gb RAM
User avatar
Clive2670
 
Posts: 577
Joined: Mon Feb 08, 2016 7:11 pm
Location: Anywhere in the World at some point on Flightgear!
Callsign: G-BLS01, BIGJET1
Version: 2018.1.1
OS: Windows 10 64bit

Re: Sun (Set & Rise) below horizon

Postby Clive2670 » Thu Apr 20, 2017 7:48 pm

Johan G wrote in Thu Apr 20, 2017 6:35 pm:
Clive2670 wrote in Thu Apr 20, 2017 5:29 pm:How is the best way to post such screen shots on the forum please [...]

This post is probably of help: FAQ: Screenshots.

When choosing an image host it is important that you can hotlink directly to the image file, which is something that can be tricky at some of them. The forum software need the URL to go straight to the image and not a page with the image for image to be shown on the forum.

Thanks Johan sorted it as you can see from above!
Thanks Clive aka: G-BLS01, BIGJET1
Can be seen flying the Boeing 777-200LR
Toshiba laptop,
Intel i5 4210U,
16Gb RAM,
AMD R7-M260 graphics 2Gb RAM
User avatar
Clive2670
 
Posts: 577
Joined: Mon Feb 08, 2016 7:11 pm
Location: Anywhere in the World at some point on Flightgear!
Callsign: G-BLS01, BIGJET1
Version: 2018.1.1
OS: Windows 10 64bit

Re: Sun (Set & Rise) below horizon  

Postby Thorsten » Fri Apr 21, 2017 5:20 am

The screenshot shows the sun *at* the horizon and a bright halo and rays extending below it.

We can now start to argue what the halo structure is supposed to represent, but if you take it to be part of the Airy disc apparently surrounding every bright light source if you view it through imperfect optics (such as the human eye) then the screenshot is fine.

Also, the horizon you see in the screenshot is the haze layer upper edge - the terrain is probably 1.5 km below (dependent on weather conditions). At that view angle, even an atmosphere which seems clear from the ground is pretty opaque.
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Re: Sun (Set & Rise) below horizon

Postby Clive2670 » Fri Apr 21, 2017 4:26 pm

Thanks for clearing that up Thorsten, Sorry to ask such a stupid question!!!
Thanks Clive aka: G-BLS01, BIGJET1
Can be seen flying the Boeing 777-200LR
Toshiba laptop,
Intel i5 4210U,
16Gb RAM,
AMD R7-M260 graphics 2Gb RAM
User avatar
Clive2670
 
Posts: 577
Joined: Mon Feb 08, 2016 7:11 pm
Location: Anywhere in the World at some point on Flightgear!
Callsign: G-BLS01, BIGJET1
Version: 2018.1.1
OS: Windows 10 64bit

Re: Sun (Set & Rise) below horizon

Postby Johan G » Fri Apr 21, 2017 6:46 pm

Clive2670 wrote in Thu Apr 20, 2017 7:48 pm:Thanks Johan sorted it as you can see [...]

You are very welcome! :)
Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video)
Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress)
Johan G
Moderator
 
Posts: 5284
Joined: Fri Aug 06, 2010 5:33 pm
Location: Sweden
Callsign: SE-JG
IRC name: Johan_G
Version: 3.0.0
OS: Windows 7, 32 bit


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