Crepuscular Light Duration Has Changed

Interesting

Bump for explanation

You would need hard evidence before anyone rational would even begin to take you seriously.

People much smarter than you would notice such anomalies. But they haven't. So it seems you are spouting bullshit.

I tell you, nothing to hide here: TAKE A LOOK FOR YOURSELF SINCE TODAY. As you are in USA, I'm still here on Northern Hemisphere in EUROPE and in these locations it's 'right' to be max 30 - 35 minutes after the sunset. Period.

Last Edited by IWASTHERE on 05/10/2012 02:31 PM

Correct - he's talking bullshit.
The timings for civl twilight, nautical twilight, and astronomical twilight, are as they should be.
As an amateur astronomy hobbyist - specifically, a deep sky observer, mostly - The time I have to wait after sundown, until it is dark enough for deep sky viewing is something I take notice of.
Especially this far north, during the summer, the amount of 'full-dark' hours I can get is at a premium.
If things were 'off', I'd know.
They're not.

As you can see, shills are spreading nonsense bullshit and they just give 1 star to the topic, SO it's good.

You are the one spreading nonsense bullshit - as usual.

Oh, and screaming 'SHILL' whenever someone points out your stupidity.....
Doesn't make you right, just makes you look even more of a fool.

Things are changing fast around.

SO did anyone notice something?

No.
And after seeing this thread, I took even more particular notice than usual this week.

All is as it should be here.

This is a 2011 video taken in June and this guy has noticed the phenomena as well. Video description:

Why is it still light out 44 minutes after sunset? Nakusp BC Canada



Last Edited by IWASTHERE on 05/10/2012 09:16 AM

This is another interesting case and it was very freak to me read that, because last year here in Italy on Feb on about 7 AM, it was completely dark:

It's 8:12 pm here in north dakota, and it's still light out. Wow...

I remember when I lived in ct as a kid, the sun would set at like 9 pm in the middle of the summer, but this is only april, lol.


source: [link to www.cafemom.com]

It's possible that down here is getting dark to soon for this time in the year?

Please post some infos such as what time you notice that and where in (Argentina? North, Center or South).

Indeed, crepuscular light duration does seem to be much longer than normal.
Dusk seems to be 30-45 minutes longer than it should be.
I have no data, this is just from casual observation.

So upon googling crepuscular light it seems to only be that it's the beams of light shining through the clouds?
Sooooo, what's the big deal?

Now if you are referring to something else such as it get's light early some days and late some days in rapid succession,
yes. Ive noticed that.

Because he's in CANADA - Duh!!!
Further North you are, the longer after sunset it stays dark in the summer.

At my location - almost 55º North - it NEVER gets fully dark from 9th May, through to 4th August.
And this is PERFECTLY NORMAL
8th May, sunset for me was at 8:52, and it didn't get full-dark until well after midnight.

Check the data yourself at a site such as this:
[link to users.softlab.ece.ntua.gr]
For my location at 54.6º North - 9th May:-
Sunset - 8:54pm
Civil Twilight - 9:39pm
Nautical Twilight - 10:42pm
Astronomical Twilight - Doesn't occur - it never gets fully dark at any point during the night.

Civil Twilight is only moderately dark - Nautical twilight is quite dark, and is what most people would consider as 'night-time' - Astronomical twilight is properly dark, dark enough for proper deep-sky astronomical observing.
As you can see - at 54.6º North, on May 9th - 'civil twilight' comes about 45 mins after sunset. Civil twilight is not very dark at all. Nautical twilight doesn't come until 1hr later, so you see, it's perfectly normal for the average person not to consider it to be 'dark' for well over 1½hrs after sunset, at northerly locations, at this time of year.

That guy in Canada (quite far North) notices it still isn't dark, 45mins after sunset....
That is NORMAL.

Oops typo in 2nd sentence...
Further North = stays LIGHT longer

What a load of *****. SO for you just because he is in Canada, that means that in that place, there are higher latitudes only in entire country. That don't make any sense also because there are locations in Canada with inferior latitude than in south England as well.

However in your 55° pretty higher latitude in UK, the twilight duration is about 45 min max.

In Nakusp BC Canada (50° of latitude) is 36 min.

Last Edited by IWASTHERE on 05/10/2012 03:06 PM

[link to www.timeanddate.com]

In Buenos Aires / (-36° latitude), the twilight duration after the sunset (Actually 18.03 or 6.03 PM), is 25 min.

Last Edited by IWASTHERE on 05/10/2012 03:06 PM

That's only until civil twilight level - it takes over an hour and a half to get anywhere near dark.

That Canada guy's video is significantly beyond 'civil twilight' (if the video light-level is accurate to reality)

So if civil twilight for him is 36 mins, then it's gonna take nearly an hour and a quarter to get dark.
And his timing of 45 mins to get significantly beyond 'civil twilight' - sounds about right.

Going by his video, and correlating with the timings - only those too stupid to understand the effect, would think there's something amiss.

Would you answer a question please?

Why have you filled your signature with links to threads which make you look like a complete astronomy ignoramus?

Maybe you are tardshill or very ignorant sorry. Now I definitely know that with you its not useful to continue.

However for the readers, today here in Italy the twilight was right in about 30 min: sunset at 20.28 (GMT +1) and the twilight was 21.02, after that it was pretty dark.

Last Edited by IWASTHERE on 05/10/2012 04:45 PM

Depends what you call 'dark'
Most people these days don't know what 'proper' night-time darkness is, thanks to artificial lighting pollution.
Your times may be correct for 'civil twilight (I haven't checked, but will take your word for it) However, civil twilight is not 'dark', it takes longer to get properly dark.


Or in other words... You've realised I know too much about the subject for you to be able to continue without looking dumb.

Fair enough tho.....
I know your kind - and arguing is pointless, because when the facts don't suit your agenda, the word 'shill' gets bandied.
(An admission that the user has no argument)
I've stated why it gets darker, slower, at higher lattitudes - so I'll also leave it at that.

Well, I remember that last summer on max twilight extension of 2 hours longer than normal in August, one hour after the sunset, I even could read a book without any artificial illumination around me. In normal duration of the twilight like today, its impossible to do that just 20 min. after the sunset, that's the simple facts, you can verify it as well.

Last Edited by IWASTHERE on 05/10/2012 06:00 PM

Hi AC 15156234:

DUCM900 is trolling since weeks - post and own threads.
First dumb Moon-threads, then J-V-conjunction, Venus or this thread.

Make an Advanced search for his user name and you will find out.

Most of us just ignore him, but unfortunately he always finds someone, who jumps on his train.


.

Thanks - I know now he's either a troll, or unbelievably stupid.

I've not been on here very long, but am now beginning to discover the regular trolls and nutters.

Here we go again with the 2 shills in fire.

What did you say?

I ve been noticing it since last year.I live in georgia,and today was the first time my wife noticed it.And you want to know whats strange.The mirowave we have in the house has been keeping military times as of last weekend.We would notice it and then set it back on regular time,and wake up in the morningat around 5am and its back to military time.Anyone else observe this.And on top of that teen daughter has a plug up clock in her room and sometimes when i go in there or she will tell me her clock wont alwasy keep the correct time,it sometimes would be 3 to 4 hours off,when it use to be just an hour off,can anyone explain this or has this been happening to you?