In Scriptures, we find many references to days of darkness, the most familiar perhaps being the ninth plague that fell upon Pharaoh and the Egyptians during the time of Moses:
But the Lord said to Moses: Extend your hand toward heaven. And may there be darkness upon the land of Egypt, so dense that it may be felt. And Moses extended his hand toward heaven. And a horrible darkness occurred in all the land of Egypt for three days. No one saw his brother, nor moved himself from the place where he was. But wherever the sons of Israel lived, there was light. (Exodus 10:21-23)
The prophet Isaiah also spoke of a day of darkness:
Behold, the day of the Lord shall come, a cruel day, and full of indignation, and of wrath, and fury, to lay the land desolate, and to destroy the sinners thereof out of it. For the stars of heaven, and their brightness shall not display their light: the sun shall be darkened in his rising, and the moon shall not shine with her light. And I will visit the evils of the world, and against the wicked for their iniquity: and I will make the pride of infidels to cease, and will bring down the arrogancy of the mighty. (Isaiah 13: 9-11)
From the New Testament, we also learn that a cloak of darkness enveloped the world when Our Lord died on Calvary as was recorded by the Evangelists:
Then from the sixth hour, there was darkness over the entire earth, until the ninth hour. (Mt 27:45).
And when the sixth hour came, there was darkness throughout all the earth, until the ninth hour. (Mk 15:33).
But it was almost the sixth hour, and there was darkness in the entire earth, until the ninth hour. (Lk 23:44).
So as not to belabor the point, it suffices to say that there are several more scriptural texts referring to days of darkness and that there is solid ground upon which later prophecies, symbolic or otherwise, were based.