I was recently listening to a favorite podcast of mine (AstronomyCast) and they went over the tidal effects the moon's gravity has on the Earth. I just happened to be thinking about the tidal effects after that and was wondering if the moon's gravity effects things in orbit of Earth. More specifically the ISS. When I tried to look this up the closest answer I found was that the ISS's orbit changes from about 320 km to 345 km, but it didn't say why this was. I can assume it probably has to do with a number of different things (eccentricity of the orbit or intentional altitude control) but I was wondering if anyone knew if the moon had any effect of this at all? Thanks.