[time-nuts] Visiting Greenwich

[Tony Finch]

Tom Van Baak <tvb at LeapSecond.com> wrote:
>
> "Why the Greenwich meridian moved"
> http://link.springer.com/article/10.1007/s00190-015-0844-y

Diverging further from questions of time (sorry), there are three
meridians of interest at Greenwich. Before Airy there was the Bradley
meridian, and the Bradley meridian is supposedly still used by the
Ordnance Survey.

http://www.thegreenwichmeridian.org/tgm/articles.php?article=8

However if you look at an OS map (e.g. 1:25,000 1st series,
http://maps.nls.uk/view/95750225) the grid doesn't match up with the
observatory, which I find curious.

Maybe it is to do with the grid origin not being on the meridian?
https://en.wikipedia.org/wiki/Ordnance_Survey_National_Grid

Tony.
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