Greenwich Meridian
About Greenwich Meridian
The Greenwich meridian is a prime meridian, a geographical reference line that passes through the Royal Observatory, Greenwich, in London, England. From 1884 to 1974, the Greenwich meridian was the international standard prime meridian, used worldwide for timekeeping and navigation. The modern standard, the IERS Reference Meridian, is based on the Greenwich meridian, but differs slightly from it. This prime meridian was first established by Sir George Airy. In 1883, the International Geodetic Association formally recommended to governments that the meridian through Greenwich be adopted as the international standard prime meridian. In October of the following year, at the invitation of the President of the United States, 41 delegates from 25 nations met in Washington, D.C., United States, for the International Meridian Conference. This inter-governmental conference selected the meridian passing through Greenwich as the world standard prime meridian. However, France abstained from the vote, and French maps continued to use the Paris meridian for several decades.
On the show — 4 mentions total
It only works if they're exactly on the Greenwich Meridian in London. You have to build them exactly there in the centre where there already is a museum.
from 283: No Such Thing As A Lost Shadow, 2019-08-23 at 00:24:59 · read transcript
Other times Greenwich Meridian came up
This has just happened 20 years ago, but we've just noticed. It's been going one way. It's been heading towards Canada, the North Pole, and mysteriously, they have no idea why it's suddenly just flipped. not a complete flip, but it's changed direction and it is now headed along Greenwich Meridian, so it is heading right here where we are right now. We could be the North Pole in about a lot of millions of years.
No Such Thing As Snappedy Chat, 2016-04-29 · listen
On an Ordnance Survey map. Oh, as in like the Greenwich Meridian kind of thing. Kind of, yeah. True North is something.
No Such Thing As Imaginary Flumps, 2026-04-30 · listen
Coordinates: 51.4778, -0.0015