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Polar night and a full moon



 
 
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  #1  
Old June 7th 17, 09:37 PM posted to sci.astro.amateur
Gerald Kelleher
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Default Polar night and a full moon

In a few day the moon phase will be full closest to the June Solstice.

https://www.usap.gov/videoclipsandmaps/spwebcam.cfm

The quality of imaging from the webcam has been exceptionally poor this year .
  #2  
Old June 7th 17, 11:06 PM posted to sci.astro.amateur
RichA[_6_]
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Default Polar night and a full moon

On Wednesday, 7 June 2017 16:37:56 UTC-4, Gerald Kelleher wrote:
In a few day the moon phase will be full closest to the June Solstice.

https://www.usap.gov/videoclipsandmaps/spwebcam.cfm

The quality of imaging from the webcam has been exceptionally poor this year .

Despite the Americans believing otherwise, the June Solstice is actually midsummer as daylight/darkness asymmetries govern the seasons even though heat/cold would seem to make the better claim. It will be polar noon in 2 weeks as the Earth continues to turn as a function of its orbital motion thereby bringing both polar points midway to the circle of illumination and the maximum areas of complete darkness of complete sunrise known as the Antarctic and Arctic circles.


Think they could afford a better camera. What is it, a Panasonic CCTV camera from the early 90's? Lots of noise.
  #3  
Old June 7th 17, 11:12 PM posted to sci.astro.amateur
RichA[_6_]
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Default Polar night and a full moon

On Wednesday, 7 June 2017 16:37:56 UTC-4, Gerald Kelleher wrote:
In a few day the moon phase will be full closest to the June Solstice.

https://www.usap.gov/videoclipsandmaps/spwebcam.cfm

The quality of imaging from the webcam has been exceptionally poor this year .

Despite the Americans believing otherwise, the June Solstice is actually midsummer as daylight/darkness asymmetries govern the seasons even though heat/cold would seem to make the better claim. It will be polar noon in 2 weeks as the Earth continues to turn as a function of its orbital motion thereby bringing both polar points midway to the circle of illumination and the maximum areas of complete darkness of complete sunrise known as the Antarctic and Arctic circles.


I remember an article in Sky & Tel from the 1970's, a report of a guy putting up a small telescope in the Antarctic. Observing was terrible where he was owing to some kind of inversion layer that obscured the sky. I had the same experience in Nothern Canada decades ago in the summer, I was 200 miles from any towns but couldn't see past mag. 3.
  #4  
Old June 8th 17, 05:15 AM posted to sci.astro.amateur
palsing[_2_]
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Default Polar night and a full moon

On Wednesday, June 7, 2017 at 1:37:56 PM UTC-7, Gerald Kelleher wrote:

Despite the Americans believing otherwise, the June Solstice is actually midsummer...


Why would Americans believe otherwise about this than folks from any other country?
  #5  
Old June 8th 17, 05:38 AM posted to sci.astro.amateur
Chris L Peterson
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Default Polar night and a full moon

On Wed, 7 Jun 2017 21:15:08 -0700 (PDT), palsing
wrote:

On Wednesday, June 7, 2017 at 1:37:56 PM UTC-7, Gerald Kelleher wrote:

Despite the Americans believing otherwise, the June Solstice is actually midsummer...


Why would Americans believe otherwise about this than folks from any other country?


This American understands that there are different accepted dates for
the beginning (and therefore the middle) of seasons, based on intent
and on history. Certainly, in medieval Europe, midsummer was
associated with the solstice. So what? Whether we adopt solar,
astronomical, meteorological, or various cultural season boundaries,
they're all somewhat arbitrary, and don't change the physical reality
of what's happening.

We understand what solstices and equinoxes are, regardless of what we
call them.
  #6  
Old June 8th 17, 06:59 AM posted to sci.astro.amateur
Gerald Kelleher
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Default Polar night and a full moon

On Thursday, June 8, 2017 at 5:38:17 AM UTC+1, Chris L Peterson wrote:
On Wed, 7 Jun 2017 21:15:08 -0700 (PDT), palsing
wrote:

On Wednesday, June 7, 2017 at 1:37:56 PM UTC-7, Gerald Kelleher wrote:

Despite the Americans believing otherwise, the June Solstice is actually midsummer...


Why would Americans believe otherwise about this than folks from any other country?


This American understands that there are different accepted dates for
the beginning (and therefore the middle) of seasons, based on intent
and on history.


There is a specific technical reason why midsummer is in 2 weeks and no other date,while the issue may look trivial it is the opposite. Of course you need to be an astronomer to weigh up the ins and outs of the matter.

Like the daily day/night cycle, the polar day/night cycle has its milestones of dawn,noon,sunset and midnight. It gets you and the kids you teach familiar with the fact that there is a separate rotation behind the events with the June Solstice at the South pole at midnight while its hemispherical counterpart polar noon.

In similar vein there is only astronomical noon when a location is midway between the circle of illumination with daily rotation then also the North and South poles are the only locations which are midway from the circle of illumination once a year.

Polar noon when it combines with daily rotation creates midsummer or midwinter depending on what Solstice is being considered. Anyone who recognizes this will come to understand there is no such thing as meteorological noon no more than it can be inserted into the weekday in competition with astronomical noon.

No insult intended, but you may be better off discussing how you pronounce a group of stars and you are exceptionally knowledgeable about magnification equipment but this astronomy is at a different and higher level.
  #7  
Old June 8th 17, 09:28 AM posted to sci.astro.amateur
Paul Schlyter[_3_]
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Default Polar night and a full moon

On Wed, 7 Jun 2017 21:15:08 -0700 (PDT), palsing
wrote:
On Wednesday, June 7, 2017 at 1:37:56 PM UTC-7, Gerald Kelleher

wrote:


Despite the Americans believing otherwise, the June Solstice is

actually midsummer...

Why would Americans believe otherwise about this than folks from

any other country?

Probably because not every other country resides in the northern
hemisphere. To Australians, the June solstice is midwinter, not
midsummer. And at tropical latitudes, spring, summer, autumn, winter
don't exist at all.
  #8  
Old June 8th 17, 11:20 AM posted to sci.astro.amateur
Gerald Kelleher
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Default Polar night and a full moon

At the moment the reflected light of the moon makes it look like broad daylight at the South pole when it is close to polar midnight -

https://www.usap.gov/videoclipsandmaps/spwebcam.cfm

There is the second image of telescopes yet they must spend $50 on a webcam even though the moon is in full view for a considerable period unlike anywhere on Earth thereby they miss being able to watch the phase changes in a seamless way ,weather permitting.

  #9  
Old June 8th 17, 09:25 PM posted to sci.astro.amateur
Gerald Kelleher
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Default Polar night and a full moon

Instead of the usual solstice posts, it should be clear that the polar day/night cycle is an astronomical jewel that shouldn't be ignored nor the surface rotation as a function of the Earth's forward motion through space that cause it.

There must be some sort of satisfaction in knowing something that the wider population does not or the fact that they are still subject to the 'tilting' Earth notion that simply can't make sense of experiences at the North and South poles and the single sunrise and sunset that occurs there each year..



  #10  
Old June 8th 17, 09:53 PM posted to sci.astro.amateur
Quadibloc
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Default Polar night and a full moon

Many people term the solstices as the first days of Summer and Winter, and the equinoxes as the first days of Spring and Fall. This is often seen in almanacs.

Abstractly, it would seem to make more sense to make them mid-season dates.

But the Earth has an atmosphere, delaying changes in temperature compared to changes in insolation. This delay, however, is not exactly half a season.
 




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