If you travel to Greenwich, stand on the famous Prime Meridian Line — which is marked with a physical line and a sculpture at the Royal Observatory — and look at your GPS, it won’t read 0° longitude. It’ll be slightly out. Who’s right? And why?
London Forecast
London
scattered clouds
36.4
°
F
39.1
°
32.3
°
89 %
2.2mph
32 %
Wed
40
°
Thu
40
°
Fri
41
°
Sat
39
°
Sun
34
°
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