Revised to replace the celestial orb and add a day-by-day moon phase. The celestial devotes its dial to a rotating chart of the heavenly bodies. At any time, its owner may admire the exact configuration of the nocturnal sky in the northern hemisphere, with the apparent movement of the stars and the phases and orbit of the moon. An Ellipse frames the portion of the sky visible from (insert your location here) and all other cities located at the same latitude.
CREDIT: Patek.com