It certainly is something you do not see everyday. On Pentecost in 351, during the reign of Constantius (the son of Constantine), the sign of the Cross appeared over Jerusalem. Saint Cyril (Archbishop of Jerusalem), in his letter to the Emperor 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"
What a great feast at that time of difficulty in the Church; I guess that is basically true all of the time.
The message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God. For it is written: “I will destroy the wisdom of the wise, and the learning of the learned I will set aside.” Where is the wise one? Where is the scribe? Where is the debater of this age? Has not God made the wisdom of the world foolish? For since in the wisdom of God the world did not come to know God through wisdom, it was the will of God through the foolishness of the proclamation to save those who have faith. For Jews demand signs and Greeks look for wisdom, but we proclaim Christ crucified, a stumbling block to Jews and foolishness to Gentiles, but to those who are called, Jews and Greeks alike, Christ the power of God and the wisdom of God. For the foolishness of God is wiser than human wisdom, and the weakness of God is stronger than human strength.
-- 1 Corinthians 1:18-25