A most harmonious Earth-Moon orbital configuration is marked out by the ancient Egyptian calendar; employing an ideal or ‘perfect’ earth year of 360 days combined with a 30-day moon synodic month. And yet of course, such a state of harmony certainly does not exist at present with the known and currently observed values of the earth year and moon month: 365.24218 and 29.53058 days respectively.
To the ancient Egyptians though, their calendar did possess a real factual basis. Indeed, the calendar itself, as established during dynastic times was truly thought to have once characterised the real celestial cycles of both the earth year and moon month, as they existed in some far off forgotten age of exceptional harmony. One may study the truth of the ancient calendar and its basis by way of the following two essays:
Image of the Sphinx with the Pyramid of Khafre in background, courtesy of Sarah