Is There Any Other Black Hole?

Binary supermasse black holes are randomly oriented in the sky so that they have every possible angle. Some of them will work just like some planetary s work out to be eclipsing systems, rightly, eclipsing binery. And for this, all that matters is your looking at an eclipsing system, and you can accurately measure the light curve. So while there's not a lot of binary supermasseblack holes out there, they do exist.