The “dark” side of the moon is a bit of a weird thing, both linguistically and for its tidally locked orbit ^^ The moon revolves around earth at the same speed it revolves around its axis. This “tidal locking” means that it is always showing the same “face” to the Earth, so that it doesn’t appear to be rotating from our perspective. timelapse showing the precession of the moon This doesn’t mean that one side is always dark and the other is exposed to the sun - just that instead of days, the moon has phases! So the situation of being “on the dark side of the moon” while the Earth is visible is not possible, but earthlight is very much a thing.