Sorry if this is a weird question, but I can’t seem to find an answer.
A couple of days ago, I was out walking the dog during a light drizzle. A rainbow formed during a break in the rain, and I said the appropriate bracha over it. Then, literally a second after I finished saying it, a second rainbow appeared right next to it. Was I obligated to say a second bracha over this new rainbow (I did, mostly because I’ve always really like that blessing)? For that matter, is it actually an obligation to say this particular bracha at all, or was I just assuming it was?