I observed the ISS when it was almost overhead and well inside Earth's shadow with binoculars. The brightness was perhaps magnitude 8 or so, I'm not sure. I observed the ISS enter the Earth's shadow when it was at 60 degrees over the horizon, the brightness declined rapidly as it entered the half shadow. But it remained visible as it passed overhead and moved toward the horizon in the East. The brightness gradually declined until I couldn't see it anymore; it didn't seem that there was ever an abrupt change in brightness after it had entered the shadow. So, how bright is the ISS when it is overhead in the Earth's shadow?