I guess you alreay know this, but for reference this is caused by earthlight (light diffused and reflected by the earth): https://en.wikipedia.org/wiki/Earthlig

I guess you alreay know this, but for reference this is caused by earthlight (light diffused and reflected by the earth): https://en.wikipedia.org/wiki/Earthlight_(astronomy) https://en.wikipedia.org/wiki/Earthlight_(astronomy) Sometimes it's clearly visible, but often I agree that it's hard to tell if you're imagining it or not.