[tz] DST on neolithic clocks

[Zefram]

http://www.ntsouthwest.co.uk/2014/04/putting-the-clock-forward-at-avebury-stone-circle/

    "Obviously Stone Age man didn't have daylight saving, so twice
    a year we have to move one of the stones." said Hilary Makins,
    National Trust Head Ranger.

-zefram