The Royal Greenwich Observatory

The Octagon room has a wonderful 18th C atmosphere.

Thank you for this. I visited today but I was very short on time and only got to walk around. It was very nice to be able to see all the instruments and have them explained so well!

I have one question, given that the various astronomer royals created their own Meridian from which to measure, doesn't this introduce some inaccuracies?

found this very interesting and informative