A colleague recently asked me if geographers have written anything on the history of distance as a concept, especially since the Medieval period and the early modern. (He had in mind Elden’s history of territory.) I must admit I was stumped.
Update (Thurs): In the comments, Clive Barnett and Stuart Elden both offer useful pointers to this. Stuart discusses it on his blog here. There is apparently some discussion in his forthcoming book, under the topic of the spatium, but as he says there’s no doubt much more to it (he points to Heidegger). Seems worth investigating!