Reference for Berakhot 105:22

ואב"א הא והא דאיכא חזנא ולא קשיא הא דאיכא סהרא והא דליכא סהרא:

Both refer to a case where the synagogue attendant is there, and there is still no difficulty One refers to a case where there is moon light, and the other when there is no moon light.

Jastrow