Talk:Polar night

Would be nice if there were an explanation of what actually causes the extreme variance in daylight cycles in polar regions. 75.161.248.110 (talk) 09:36, 29 January 2013 (UTC)[reply]

The polar day/night cycle where roughly 6 months of daylight follows 6 months of darkness is due to the fact that in addition to daily rotation to the central Sun,over the course of a year our planet has another surface rotation to the central Sun due solely to the orbital behavior of the Earth.If you look at the planet Uranus and its unique features,you will see it turns South to North as a consequence of its daily rotation along the line of its rings but also turn East to West as a component of its orbital motion - http://londonastronomer.files.wordpress.com/2013/01/uranus_2001-2007.jpg

Applied to our planet,a person standing on the South pole will turn 360 degrees to the central Sun and take an entire year to do so.When mixed together with daily rotation at lower latitudes this becomes the seasons so this explanation displaces the old and awkward 'tilt' explanation to the Sun as obviously it is impossible to explain the polar day/night cycle using that 'tilt' notion. Orion216 (talk) 07:14, 28 October 2013 (UTC)[reply]

If you stand still at the South Pole you will find yourself turning approximately 360 degrees every day. The only way that you could possibly find it taking an entire year is if the Earth were to keep one face toward the sun much as the moon keeps one face toward the Earth. 65.68.190.169 (talk) 06:58, 21 April 2015 (UTC)[reply]

There doesn't really seem to be any polar night in Vorkuta during the 5th of January, It's more southern than Kiruna and polar night in Kiruna ends at the 1st of January. SuperHypercane (talk) 19:54, 11 December 2013 (UTC)[reply]

•  Done and replaced for another real photo of polar night in Russia. --Brateevsky ^{(talk to me)} 16:28, 15 October 2015 (UTC)[reply]

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   Being uncertain what "wikt:free horizon" means, i linked it to its article and found that that creates a red link. My bet is that "free horizon" relative to an observer means either

• a point at which the observer's line of sight, perpendicular to the line thru them and the center of the planet, intersects only transparent space, or
• (more likely) a complete circle of such points: a clear full horizon or fully clear horizon. I'll probably populate my red link accordingly, accompanied by a stub tag, and disclaimers in the edit-summary and on the talk page, to the effect that that's an AGFWAG, since three solid dicts fail to mention it.
  --Jerzy•t 12:39, 20 September 2016 (UTC)[reply]
  

Since the earth is tilted 23.44°, and

98.31.29.4 (talk) 04:13, 15 December 2020 (UTC)[reply]

There is no such a thing "Emerald Campus Twilight". Below 18°, the sky is complete dark. Also: astronomical twilight are hard to see within an urban environment with lot of sky glow from lighting pollution. זור987 (talk) 07:18, 15 December 2020 (UTC)[reply]

Ok, since the sky is completely dark when the sun is more than 18° below the horizon not 24°, so in that case how long does

I start with the caveat that I don’t have time to make these edits myself, but I came to this page hoping for more description on how humans interact under polar night conditions. I had a few thoughts on how this page might might be improved:

- expanding a “mental health effects of polar night” subsection;

- a section on service provision in polar night conditions: I would imagine, for example, that virtually all public services - everything from postal delivery to park maintenance - have made lighting/ safety/ practicality operational changes to adapt to low light conditions;

- crime: someone, somewhere has to have written an academic paper with the hypothesis that crime is either higher under the atypical mental health conditions imposed by polar night, or that crime is simply harder to convict on due to low light conditions. 2603:7000:3D00:1882:9942:11F4:8E21:2E71 (talk) 12:24, 22 January 2024 (UTC)[reply]

This article was the subject of a Wiki Education Foundation-supported course assignment, between 19 February 2024 and 18 March 2024. Further details are available on the course page. Student editor(s): Ail39 (article contribs).

— Assignment last updated by Ail39 (talk) 04:36, 28 February 2024 (UTC)[reply]