At His first Advent, a star announced His birth to the Magi, the wise men from the East.
“Saying, Where is he that is born King of the Jews? for we have seen his star in the east, and are come to worship him.
When they had heard the king, they departed; and, lo, the star, which they saw in the east, went before them, till it came and stood over where the young child was. When they saw the star, they rejoiced with exceeding great joy. And when they were come into the house, they saw the young child with Mary his mother, and fell down, and worshipped him: and when they had opened their treasures, they presented unto him gifts; gold, and frankincense, and myrrh.”(Matt.2:9-11).
At His second Advent, the Sun, Moon, and Stars will announce His Coming(Parousia) to the whole Universe.
“Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken: And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.”(Matthew 24:29-30 KJV).
“And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood; And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind. And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places. And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bondman, and every free man, hid themselves in the dens and in the rocks of the mountains; And said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb: For the great day of his wrath is come; and who shall be able to stand?”(Revelation 6:12-17 KJV).
Therefore, the darkening of the Sun, Moon, and Stars is a precursor to the Second Advent. There is not a single verse of the Scriptures that speaks to His coming seceretly or silently or suddenly to rapture the Church.
Then, when these things begin to happen, then look up, and lift up your heads, for your redemption draweth nigh.
“And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring; Men’s hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken. And then shall they see the Son of man coming in a cloud with power and great glory. And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh.”(Luke 21:25-28 KJV).
There shall be signs in the Sun, Moon, and Stars. The nations of the Earth shall be in distress, with perplexity. Men and nations shall be confused and confounded, and their future uncertain. All the statesmen and the academics of the world put together will not be able to profer solutions to the chaos and confusion in the world. Men will go to war not knowing what they are fighting about. The seas will be roiling and waves will be roaring. There shall be tsunamis, earthquakes, tropical storms and hurricanes etc. The hearts of men who are in ignorance of the times and seasons(epochs) shall fail being seized with fears, anxieties and worries over the goings-on on Earth.
On the contrary, when these things begin to happen, believers who have survived up to this time shall begin to rejoice. They will lift up their heads because their redemption draws near. They are about to be rescued, evacuated from the scene of persecution, destruction and devastation. Opi ike g’egbu. Then, the sign of the appearance of the Son Of Man, the Shekinah, shall be seen in the heavens. Then shall He dispatch His angels with the sound of the trumpet to gather His elect(ekklektos), from one end of the heaven to the other. Behold, am with you always unto the End Of The Ages(Matt.28:18). He that endures to the end(of the ages) shall be saved(rescued)[Matt.1022].
I challenge every pretrib to show me the verse of the scripture in the Olivet Discourse in Matt.24, Mk.13, And Luk.21 that speaks of the rapture before the darkening of the Sun, Moon, and Stars. It does not exist.