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  #1  
Old September 19th 16, 02:35 PM posted to sci.astro.amateur
Gerald Kelleher
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The surface rotation as a function of the planet's orbital motion is observed through the motion of the North pole across the sunlit face of the Earth and parallel to the orbital plane. The evolution of Arctic sea ice responds to the surface area at polar latitudes do not face the Sun from September to March in an expanding circumference than reaches the Arctic circle on December 21st.


https://www.youtube.com/watch?v=GVJ9DfVhAYw

https://www.youtube.com/watch?v=CFrP6QfbC2g

In graphics or actual imaging it is the same - when daily rotation is subtracted, the entire surface of the Earth turns once to the central Sun as a component of the planet's orbital motion through space.

NASA shows how sea ice melts over the period while I show why it melts by way f planetary dynamics.
  #2  
Old September 19th 16, 04:17 PM posted to sci.astro.amateur
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On Monday, September 19, 2016 at 1:36:14 PM UTC+1, Gerald Kelleher wrote:
when daily rotation is subtracted, the entire surface of the Earth turns once to the central Sun as a component of the planet's orbital motion through space.


So 365.25 daily rotations plus one more = 366.25 rotations per year.

Thanks, I get it now.
  #3  
Old September 20th 16, 07:56 AM posted to sci.astro.amateur
Gerald Kelleher
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It appears that the dual surface rotations responsible for so many terrestrial experiences and effects is moving towards normalization -

https://www.youtube.com/watch?v=GVJ9DfVhAYw

https://www.youtube.com/watch?v=CFrP6QfbC2g

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

Its a good time to be alive with so much imaging and graphics available while telling so many good stories including that wonderful sunrise in a few days joining the daily sunrise -

https://www.youtube.com/watch?v=okw6Mu3mxdM

 




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