I have recently been recommended a book, but I don't remember its title, nor its author. It's about an astronomical event that makes all humanity experience/see their lives some exact number of years in the future for a short moment.
Afterwards, everybody goes back to the present and we are presented with the stories of certain individuals who change their lives based on the information they have about the future.
Possibly Flashforward by Robert J Sawyer? Physics experiment rather than astronomical event, but gave people a vision of their futures, then follows how they responded to that knowledge.
Two minutes and seventeen seconds that changed the world
Suddenly, without warning, all seven billion people on Earth black out for more than two minutes. Millions die as planes fall from the sky, people tumble down staircases, and cars plow into each other.
But that’s the least of the survivors’ challenges. During the blackout, everyone experienced a glimpse of what his or her future holds—and the interlocking mosaic of these visions threatens to unravel the present.
