That is true; the Moon, unusually large compared to its parent planet (Earth) was not with us all the way from the beginning. It appeared later in the sky and since then it has accompanied Earth on its yearly voyage around the Sun.
The Moon, an almost perfect sphere of unnatural origin, remains in a deep though strange relationship to the Earth. It is aligned on the same plane as the Earth. It circles our planet in a perfect circular orbit and keeps always the same face toward us.... (article with images & video)