There is a great deal of apparent Biblical significance going on astronomically and astrologically of late, but anyone who tells you that they absolutely know for certain what any of it means is deluding themselves.
The so-called “Great Sign” has been known to be astronomical/astrological in addition to any other significance for a very long time. I’d say that it indicates that time is getting very short, as far as the return of Jesus Christ. That much seems clear to those who don’t reject such things as star signs who are devout Christians.
Here’s a PDF of an old book, “Gospel In The Stars” that might be helpful to those who are struggling with the notion, not trying to sway anybody but I’m just offering it up for understanding, for those who may be interested:
http://www.teachingfaith.com/files/books/the_gospel_in_the_stars.pdf
I saw this last year but forgot that the date is coming up next month. I found it really very interesting. Think I will revisit the YT video. Thanks for posting!