Commemoration of the Cross of Light that shone over Jerusalem on Pentecost in 351. What is the full, true meaning of the Cross?
On this day in the year 351, not long after Cyril had succeeded Maximus as Archbishop of Jerusalem, during the reign of Constantius, the son of Saint Constantine the Great, on the day of Pentecost, the sign of the Cross appeared over Jerusalem. Saint Cyril, in his letter to the Emperor Constantius, says, "At about the third hour of the day, an enormous Cross, formed of light, appeared in the heaven above holy Golgotha and reaching to the holy Mount of Olives, being seen not by one or two only, but manifest with perfect clarity to the whole multitude of the city; not, as one might suppose, rushing swiftly past in fancy, but seen openly above the earth many hours in plain sight, and overcoming the beams of the sun with its dazzling rays" (PG 33:1 16q).
see more here: http://www.goarch.org/chapel/saints_view?contentid=43
To you, what is the Meaning of the Holy Cross?