Something I need to note about what happened on that day, with the sign in Heaven, is that it was never supposed to be interpreted as a current day event. The whole thing was comms. From God.
Think of the sign as more of an echo of something that's already happened, a sort of… confirmation, a sign to us currently of where we are in the Revelations timeline.
We've already seen the sun become as black as a sackloth of hair. We've seen the moon become red, for a whole tetrad.
The only event that hasn't happened is the great earthquake.