In my experience, it can be tricky to tell dreams from astral projection. And dreams from waking life for that matter. At least once I've seen Earth in a similar way to you - the only difference being the angle - and it was very much astral projection rather than a dream. The biggest difference I've found between the two states is that in the case of projection, I can remember the process from the time I began relaxing, through the beginnings of the astral sensation to the end of the session. As opposed to dreams, which have a gap between the memory of relaxing and the image. The dream just seems to suddenly begin, like starting a movie halfway through.
The secret of Zen is just two words: not always so. —Shunru Suzuki Roshi
Because one believes in oneself, one doesn't try to convince others. Because one is content with oneself, one doesn't need others' approval. Because one accepts oneself, the whole world accepts him or her.
- Lao Tzu