NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: NOW what?
From: Stephen N.G. Davies
Date: 2015 Aug 15, 08:23 +0800
From: Stephen N.G. Davies
Date: 2015 Aug 15, 08:23 +0800
I think the answer has to do with the Johns Hopkins lab where the effective datum meridian for GPS was established. They set up the GPS coordinate system on WGS84 and for whatever reason (someone better geodetically versed than I will know) did so such that the original meridian line on the ground at Greenwich was a couple of hundred meters to the side of GPS zero. Stuff happens.
Stephen D
Sent from my iPhone
Sent from my iPhone
This article is very confusing: the prime meridian cannot be wrong. The prime meridian is arbitrary (unlike the equator). Where you decide to draw it there it will be. That GPS designers decided to place it differently from the 18 century astronomers, and why did they do this, the article does not explain. Alex. ________________________________________ From: NavList@fer3.com [NavList@fer3.com] on behalf of Norm Goldblatt [NoReply_Goldblatt@fer3.com] Sent: Friday, August 14, 2015 5:16 PM To: eremenko---.edu Subject: [NavList] NOW what? http://www.iflscience.com/prime-meridian-greenwich-wrong-place [PLAIN TEXT VERSION OF MESSAGE AUTO-GENERATED. ORIGINAL MAY INCLUDE MORE CONTENT] ---------------------------------------------------------------- NavList message boards and member settings: www.fer3.com/NavList Members may optionally receive posts by email. To cancel email delivery, send a message to NoMail[at]fer3.com ---------------------------------------------------------------- : http://fer3.com/arc/m2.aspx/NOW-what-Goldblatt-aug-2015-g32436
