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Originally posted by SonOfTheLawOfOne
Originally posted by ngchunter
Originally posted by sechmet
We have some "shift" in the Earth's rotation angle, thats the probably reason.
Isn't it impressive?
Therefore the star should have been 294.2 arcseconds from the north celestial pole.
My camera and telescope combination produce an angular resolution of 1.88 arcseconds per pixel when the images are scaled down to 1024 resolution:
I measured USNO-A2 1725-00691811 to be 156.9 pixels from the NCP in the image I took that night:
The original image is here:
That corresponds to a distance of 294.972 arcseconds from the NCP, less than an arcsecond from the expected value and well within the resolution of the image itself (in other words, no change in our tilt was detected). An arcsecond, by the way, is 1/3,600th of a degree.edit on 14-1-2011 by ngchunter because: (no reason given)
Here's a thought I haven't seen in the thread yet...
What if the equatorial bulge of the planet has enlarged? If you think of it that way, the planet would "squish" down a little, removing a bit of the arc of the horizon at the higher latitudes. The glacial rebound theory makes sense in this case, but I don't have the trigonometric knowledge to figure it out.
Another poster mentioned that it would take approximately 570' of elevation change to see the sun over the horizon 2 days earlier based on the degree of tilt for that region. So maybe it isn't a 570' change in elevation, but an overall lowering of the horizon due to the squashing effect of the equator bulging out further?
The only plausible answer left would be a greater bulge at the equator that is happening at a much greater rate, either from glacial rebound, more water, something.... the causes of that are beyond my understanding of geology, but I'm sure there are astronomical possibilities for this as well.
Originally posted by ignorant_ape
reply to post by Human_Alien
my opnion , thy hasnt the entire world noticed this too ?
unless its :
1 a hoax
2 an observational error / error in the tables
3 greenland has moved - relative to other land masses