Andrew McCarthy captured the ISS in front of the moon and this resulted in a very inspiring photograph!

The moon is around 1000 times farther away from earth than the ISS, but still the ISS looks tiny despite being over 100m long. In this shot the ratios may be different, because the telescope does not look straight up, but at an angle. So the distance from the telescope to the ISS is probably far more than just 400km. But putting the moon a few hundred km further back, would not affect its size so much. (Think of the dolly zoom effect.)

As the sizes of the moon, the ISS and the orbits are known, it should be possible to calculate the distance between telescope and ISS. Maybe you could calculate the location of the telescope as well.

https://cosmicbackground.io/pages/new-frontiers