Here is an article for clarification on the Revelation 12:1-2 Sign. Last week's article clarified Revelation 12:5.
http://watchfortheday.org/signofisrael.html
Daniel Matson
"Therefore if you will not watch, I will come upon you as a thief, and you will not know what hour I will come upon you.”Revelation 3:3 NKJV