The Society's own website says "Meeting nights were indicated by a lamp hung over the Fleet Street entrance to the courtyard." Matt Brown of Londonist thinks (and we agree with him) that this lamp, at the centre of a sort of armillary sphere, is inspired by that lamp from over 200 years ago.
Site: Crane Court - Royal Society (1 memorial)
EC4, Crane Court
The Royal Society met at the north end of Crane Court from 1710-80, that's the end behind our camera.
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