This answer is fine as far as it goes, but it ignores the loss of precision involved if you iteratively compute with it. This does happen, even in contexts that

This answer is fine as far as it goes, but it ignores the loss of precision involved if you iteratively compute with it. This does happen, even in contexts that NASA cares about. Hopefully they look for this, or they will find they've managed to navigate to the wrong star on some future interstellar mission.