here. In honor of the day, here's a coin of Mercury! Gallienus, AD 253-268. Roman silvered billon antoninianus, 4.25 g, 21.3 mm, 11 h. Antioch, AD 267. Obv: GALLIENVS AVG, radiate and cuirassed bust, right. Rev: FIDES AVG, Mercury standing right, holding marsupium (purse) and caduceus; PXV (=TR P XV) in exergue. Refs: RIC 607F; Göbl 1667k; Cohen 219; RCV 10212; Hunter p. lxx. Post your coins of Mercury or Sol in honor of today's celestial event!