On Julian’s coins there is the strong bull. But this is not some Egyptian Apis Bull but a Zodiacal bull – it is Taurus. The two stars are the bright conjunction of Venus and Mars in the horns of Taurus as Julian is acclaimed Emperor in Paris by his troops. They are the divine sign.
This is picture from Stellarium software showing conjunction of Venus and Mars in Taurus on the 4th May 360.
The bull as Taurus was mentioned in “Notes on the coinage of Julian The Apostate”, F..D. Gilliard, JRS 54, 1964″.
The Emperor Julian: Panegyric and Polemic By Mamertinus Claudius