Greenwich meridian is slightly out – but why?

http://theconversation.com/heres-why-the-greenwich-prime-meridian-is-actually-in-the-wrong-place-46302?utm_medium=email&utm_campaign=Latest+from+The+Conversation+for+August+21+2015+-+3284&utm_content=Latest+from+The+Conversation+for+August+21+2015+-+3284+CID_ea29712593ab3a084670ac8a324cdd9c&utm_source=campaign_monitor_uk&utm_term=Heres%20why%20the%20Greenwich%20Prime%20Meridian%20is%20actually%20in%20the%20wrong%20place

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