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By September 21st we’ll have 12 hours of daylight. Once the sun rises on 19 October it will not set again until 24 February.
In your estimation what is the angle of Earth's axial tilt these days? How much does it now differ from 6 months ago?
axial tilt The angle by which the rotational axis of the Earth differs from a right angle to the orbital plane; this angle varies between 21.5° and 24.5° over a cycle of 40 000 years and at present is about 23.5°.
Obviously at 'dawn' the sun is near the horizon this time of year, exactly as in the video.
Originally posted by luxordelphi
reply to post by AndyMayhew
Obviously at 'dawn' the sun is near the horizon this time of year, exactly as in the video.
This thread started out about twilight for a reason. I've looked at a number of online calculators for McMurdo and Scott Base. None of them seem to indicate that twilight, civil-nautical-astronomical, is happening. They don't reference any of these twilights. They say that the sun is up all day. It supposedly rose, permanently (until sometime in Feb. anyway) on Oct. 20 or so. Why then is it rising again?
The sun never actually dips below the horizon, but it will dip towards and then rise again.
So again, during the summer time at the South Pole (and when it is summer at the North Pole), the sun each day will appear to rise up in the sky...
I have noticed slow down and speed up and also the sun, moon, stars and planets at the wrong elevation for my latitude.
I am talking about the sun rising, in the normal and common and traditional sense and NOT about the sun 'rising up' in the sky in the sense of dipping.
It seems that your personal elevation may be excessive for your latitude.
I watched the Moon set this morning and I've been watching it rise tonight. It absolutely will not be directly overhead tonight. You need some equipment to accurately measure what you claim.
It is showing exactly what I tried to describe to you: during the summer time, the sun will never set below the horizon, but will appear to skim it.
Astronomical twilight is defined to begin in the morning...when the center of the Sun is geometrically 18 degrees below the horizon
Nautical twilight is defined to begin in the morning...when the center of the sun is geometrically 12 degrees below the horizon
Civil twilight is defined to begin in the morning...when the center of the Sun is geometrically 6 degrees below the horizon
The U.S. Naval Observatory defines sunrise as when the leading edge of the sun clears the horizon
Astronomical twilight (the sky is completely dark)
Amateur astronomical twilight (the sky is dark enough for most astronomical observations) 15 degrees, AMATEUR
Nautical twilight (navigation using a sea horizon no longer possible)
Civil twilight (one can no longer read outside without artificial illumination)
Sunrise-Sun's supper limb touches the horizon; atmospheric refraction accounted for/0.833 degrees, DEFAULT
Twilight is the time between dawn and sunrise or between sunset and dusk, during which sunlight scattering in the upper atmosphere illuminates the lower atmosphere, and the surface of the earth is neither completely lit nor completely dark.
At the poles, civil twilight can be as long as two weeks, while at the equator, conditions can go from day to night in as little as twenty minutes.
The lowest latitudes at which the various twilights can continue through local midnight are approximately 60.561° (60° 33’ 43”) for civil twilight, 54.561° (54° 33’ 43”) for nautical twilight and 48.561° (48° 33’ 43”) for astronomical twilight.
The most extreme contrast to the first graph, of sunrise and sunset at the equator, is provided by the South (or North) Pole, shown above. Six months of daylight, from Spring to Autumn, are followed by nearly two months of fading twilight, nearly three months of darkness, and a further two months of brightning twilight before the sun is seen again.
I wish nothing but health and happiness to all, but I do get a wee bit of smug comfort knowing you're gonna chase this thing your whole life and never get so much as a scintilla of evidence that it exists.
Originally posted by luxordelphi
There's plenty of evidence for Planet X (and growing all the time) and also plenty of evidence of a conspiracy to cover it up (which begs the ever fascinating question of motive).
Okay, I'm trying to figure out why you think that the sun will not dip towards and away from the horizon at 78 deg S...
It's only directly at the south pole itself, S 90 Deg where the sun will not dip at all for a certain time period during their summer.
Since we’ve been here the length of daylight is getting noticeably longer. When we arrived last Wednesday sunrise was at 10:53AM and sunset was at 2:59PM. Today sunrise is at 9:41AM and sunset is at 4:08PM, giving us more than 2 hours more daylight now than just a week ago. By September 21st we’ll have 12 hours of daylight. Once the sun rises on 19 October it will not set again until 24 February.
McMurdo lies at 77.86º south latitude
Latitude/longitude: 77°50′56″S
BTW - You're right, I've never been to the Antarctic. But I have been above the Arctic circle for about 2 weeks while I was in the US Navy during a North Atlantic deployment.
I'm sorry Lux, but I have to call lens or glass artifact on that.
No, you've identified so-called "evidence" that you insist supports your belief that Planet X exists, but no actual evidence of its existence.
...there's no reason to immediately jump to the assumption that's it's all the result of a rogue planet/brown dwarf.
Originally posted by luxordelphi
reply to post by ColAngus
No, you've identified so-called "evidence" that you insist supports your belief that Planet X exists, but no actual evidence of its existence.
Better, smarter, far more credentialed people than me have been searching for it since the 1960's. I don't think you really know what you're talking about but, congratulations for returning to ATS with a brain and not just comic relief. Some of your argument is valid:
...there's no reason to immediately jump to the assumption that's it's all the result of a rogue planet/brown dwarf.
However, the explanations sans Planet X are pretty much out at the extreme spokes.