Besides the above, there are rainbows and double bows to be seen from indoors as well as halos and other atmospheric phenomena
Moon coronas also and moon halos.
If I have a glass of water on the table and the light bounces off the surface of the water onto the wall, I can see this solid...
Meteors are seen fairly easily from inside near a window, and the occasional fireball.
You are probably too far south, but I have also seen aurorae and noctilucent clouds from inside and photographed them.
During the day with the curtains almost closed I get a constant display in...