Rev. 6:12 - 17  And I saw when he opened the sixth seal and there was a great earthquake; and the sun becme black as sackcloth of hair, and the whole moon became as blood;  and the stars of the heaven fell unto the earth, as a tree casteth her unripe figs when she is shaken of a great wind.  And the heaven was removed as a scroll when it is rolled up and every mountain and island were moved out of their places.  And the kings of the earth, and the princes, and the chief captains, and the rich, and the strong, and every bondman and freeman, hid themselves in the caves and in the rocks of the mountains; and they say to the mountains and to the 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 their wrath is come; and who is able to stand"?

The stars fall from the sky, these probably are an asteroid or meteorite shower.  There is a huge earthquake where every mountain is moved from it’s place.  People finally recognize that this is the Wrath of God, whereas before they may have explained away all the death and suffering as a result of other causes.  We are now in the first half of the tribulation period.  3 1/2 years.  In the first half, we will see; the rulership of ten kings over ten different kingdoms, the preaching of 144,000 Jewish evangelists, the preaching of two witnesses of chapter 11, the return of prophet Elijah (Mal. 4:5) and the rulership of a one world church known as ‘Ecclesiastical Babylon’.