>The Great Sign in Heaven happened - September 23rd, 2017. We only have 3.5 years = ~ March 2021.
Actually, starting from the Blood Moon signs, exactly 7 years to the day will be September 21, 2021. On that day, there will be a Solar Eclipse over Jerusalem, which is a major fulfillment of prophecy. There will not be another Solar Eclipse over Jerusalem for a decade after that date.