Talk:New Mexico meridian

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I am a little confused. There are/were two NM principal meridians that have been used. As far as I can tell the one listed in the article, 106 53' 40", is no longer used. I have an old map that uses 106 53' 40", as written in the article, but my 1917 map is the same age as reference 1 (1914).

The BLM has this one: 106 53' 12" ( .

I don't know the history but according to wikipedia the Greenwich prime meridian has been within 5" of the same spot since Airy (1841). It would be nice to sort this out and mention it explicitly. — Preceding unsigned comment added by (talk) 13:13, 9 September 2013 (UTC)