In a hijacked post by GeeOddMike?ÿ (see post on?ÿFour Corners by MathTeacher ) he shows his handheld GPS on the Greenwich meridian.
It shows that for longitude it does not read?ÿZero (DMS.sss). I don't see any posters that wonder why(?) but I see fit to try to give everybody
an answer. Back in 2015 there was a paper in Journal of Geodesy (some articles are open source, and this one is);?ÿ
"Why the Greenwich meridian moved", Journal of Geodesy (2015)?ÿ89: pp 1263-1272.?ÿThis paper is the first to give scientific reason why your
GPS receiver does not read?ÿZero Longitude.
The first time I came across this was in 1971 reading an article in the journal?ÿNavigation, Vol. 18 #2, June 1, 1971.?ÿThis article is referenced in the Journal of Geodesy paper; Title?ÿNavigation at the prime meridian?ÿby Gebel and Matthews (I have this but can't find it yet; give me some slack, it only been 49 years since I read it).?ÿ
Just before I was going to make this post my wife ask me if I had checked "YouTube". No I had not. I did check and found some interesting stuff.
For YouTube: type in why the Greenwick meridian is not the prime meridian. Scroll down till you find an old map with the near same title and a time stamp of 11:47 on the map.?ÿ
Note: you might want to pull your Geodesy book out and read on?ÿDeflection of the Vertical.
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JOHN NOLTON
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https://link.springer.com/article/10.1007/s00190-015-0844-y
or directly here: https://link.springer.com/content/pdf/10.1007/s00190-015-0844-y.pdf
link above is to a PDF of the article Mr Nolton mentions. It is ??Open Access.??ÿ
an article for the general reader is here: https://www.timeanddate.com/geography/prime-meridian-wrong.html
Thank you for posting the article for me out of Journal of Geodesy. I should learn how to post like you have done but I am?ÿOLD.
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JOHN NOLTON
Mr Nolton,
No trick involved. Copy the URL and paste it in your post. The magic occurs on the this site??s side.?ÿ?ÿ
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