Hi, I just bought a cool used hanging ceiling light fixture, but the
wires coming out of the fixture are confusing. There are two covered
wires and one naked copper one. I assume the copper wire is the
ground, but the two other wires are both white. How can I tell which
is connected to the house's hot wire, and which to neutral?

I've seen the reverse of this question here, where both house wires
are the same color, and I know you'd use a voltage meter in that
situation, but with no power to the light fixture, how can I be sure
to hook it up correctly?

Thanks for any help you can give me!