"Thus was displayed the last of those signs of His coming, concerning which Jesus bade His disciples: “When ye shall see all these things, know that it is near, even at the doors.” Matthew 24:33 . After these signs, John beheld, as the great event next impending, the heavens departing as a scroll, while the earth quaked, mountains and islands removed out of their places, and the wicked in terror sought to flee from the presence of the Son of man. Revelation 6:12-17 . GC 334.2"
"So likewise ye, when ye shall see all these things, know that it is near, even at the doors."
Ellen White directly references Matthew 24:33 in this passage.
"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?"
Ellen White directly references Revelation 6:12-17 in this passage.
"Many who witnessed the falling of the stars, looked upon it as a herald of the coming judgment, “an awful type, a sure forerunner, a merciful sign, of that great and dreadful day.”—“The Old Countryman,” in Portland Evening Advertiser, November 26, 1833. Thus the attention of the people was directed to the fulfillment of prophecy, and many were led to give heed to the warning of the second advent. GC 334.3"
"The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the Lord come."
The falling of the stars is linked to the coming judgment, echoing the themes in Joel 2:31.
"In the year 1840 another remarkable fulfillment of prophecy excited widespread interest. Two years before, Josiah Litch, one of the leading ministers preaching the second advent, published an exposition of Revelation 9 , predicting the fall of the Ottoman Empire. According to his calculations, this power was to be overthrown “in A.D. 1840, sometime in the month of August;” and only a few days previous to its accomplishment he wrote: “Allowing the first period, 150 years, to have been exactly fulfilled before Deacozes ascended the throne by permission of the Turks, and that the 391 years, fifteen days, commenced at the close of the first period, it will end on the 11th of August, 1840, when the Ottoman power in Constantinople may be expected to be broken. And this, I believe, will be found to be the case.”—Josiah Litch, in Signs of the Times, and Expositor of Prophecy, August 1, 1840. GC 334.4"
"And the four angels were loosed, which were prepared for an hour, and a day, and a month, and a year, for to slay the third part of men."
The EGW passage directly references and interprets Revelation 9:15 in the context of Josiah Litch's prediction about the Ottoman Empire. The connection is clear and intentional.