It sure looks like one from the bottom. If I could see a side view, it would help, but I doubt if you can climb up a ladder to get a good photo, huh?

It is possible that it is a moth cocoon, but most encsse their pupa in a papery sack that is fastened to limbs or branches of trees, rather than suspending them from a ledge or something similar.

Susan

Ok, here are a couple of other angles.

It is almost a perfect sphere except for the funnel opening.

The garden spider sac has more of an egg shape:

I would say with 90% accuracy that this is the egg of a Golden Orb Weaver. I found one last year that didn't survive the winter, and it is identical.

Amy, I am inclined to agree with you. I ultimately had 3 egg sacs from my Argiope aurantis, and I think you said you just had one, right, Tigerdawn? I bet you had more than one, and this is #2.

Like you, I don't think mine have emerged yet, but I don't know exactly when they will, time of day, etc.

Susan

It's just odd that two egg sacs from the same species can look so different.