Fair enough what we can say with certainty is that the Revelation 12 sign appeared on September 23, 2017 during the Feast of Trumpets, that this is the first time it has appeared since John wrote the book of Revelation and that it will not appear for another thousand years. Better?
You cannot say with certainty that Revelation 12 has taken place. You and others make too much of the reference to the sign that John sees. It is just who God revealed it to him so that he would write it that was, so that we who are reading would understand its symbolic significance. It is not to be taken as some cosmic sign!
Revelation 12 symbolically describes the woman as being Israel and what is going to happen to her in the future. At the sounding of the 7th trumpet, the resulting plague will be Satan and his angels being cast out of heaven and restricted to the earth, which is also the 3rd woe (Therefore rejoice, O heavens, and you who dwell in them! But woe to the earth and the sea; with great fury the devil has come down to you, knowing he has only a short time.”) The dragon/Satan will pursue the woman/Israel and the woman will flee out into the wilderness to a place where God will care for her for 1260 days, which is that last 3 1/2 years of the seven year tribulation, the last half being the great tribulation.
John's vision has nothing to do with the planets.