36.sundial

Portable sundial - its ground plan is at (1), the face in perspective at (2), and its elevation at (3). The winter solstice (bruma) is given as the eighth day before the calends of January, that is 23 December, and the summer solstice (solstitium) as the eighth day before the calends of July, ie 22 June. (From Cyril Bailey, The Legacy of Rome, Clarendon Press 1923)