Orienting a instanced Objects long-axis to the same point

Hi guys, I know should be easy but i’m very fresh on Unity!
I’m in a 2D environment, i have a sun, and i will instance some rays, long and narrow. Rays will spawn randomly with an end inside the sun disc area.
So, how can i set the ray rotation (on z) to make the long axis pointing always the center of sun? I need a temp vector?

I tried some code but results are far to be good.
Thanks to all that will have time and patience to land some tips!

[SOLVED]
So, that’s fine enough.
I’d created a parent-child structure on ray, with an empty object as parent.
I’d adjusted the parent’s pivot on the ray long axis, out of the shape, at a distance from end based on sun width, then i made the prefab.
Now i have just to instantiate the prefab on sun center, with random z value…and i got it!