The Bible speaks of signs that will show us when the end times are near. Some of these events have already occurred in history. Luke 21:25-26 tells us this:

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.

This passage in Luke refers to the Dark Day of 1780 and the meteor showers of 1833 that ushered in the great Advent movement. After the 1260 years of papal suppression of the truth, New England experienced the famous Dark Day on May 19, 1780, followed by signs in the moon as well.

On November 12, 1833, a great meteor shower occurred. Nearly 200,000 meteors fell per hour. These signs were seen across the United States. Many believe that these signs are a fulfillment of the Biblical signs of Christ?s Coming.

The 1260-year tribulation came to an end in 1798. It was then that God began the final chapter of human history in which we now live.

These signs ushered in the "TIME OF THE END".
The 1260 of papal oppression ended in 1798.
A time of freedom in which the gospel was being spread all around the world began.
God raised up a church to give the last warning message of Revelation 14

The great earth quake in Lisbon, 1855, announced the end of the sixth woe (Rev. 11:13-14) but there was still a third woe.

Soon after (WWI and WW2) we see the nations of the earth in great distress, the symbolic sea and waves roaring and men's hearts failing them for fear. Yet these were still a prelude to the final wave which is looming over our heads right now.
Those signs may very well all appear again at the close of probation. They marked the beginning of the "time of the end" and may very well mark the end of "The time of the end".
At the end of the 6th plague we again read of a great earthquake:
Rev, 16:18 there was a great earthquake, such as was not since men were upon the earth, so mighty an earthquake, [and] so great.