Dont forget, tonight the moon will be visible from earth. Last time this happened was over 10 hours ago!
I can in fact tell you approximately where Homeworld is in the night sky. It's stated to be in another galaxy and Pearl has pointed it out to Steven. There's three galaxies visible from earth. Two dwarf galaxies, known as the Magellanic clouds and the Andromeda galaxy. While any are a possibility, I suspect one of the clouds due to distance from us and they're close enough together that you can cover them both with one kiss.