A perfect gift for your favorite astronomer! The face of this handsome wristwatch is a mini planisphere that really works! Rotate the faceplate to any time and date and it displays a map of the constellations visible from mid-northern latitudes. Luminescent background glows in dark for 2 to 3 hours. Rubber/steel band adjusts to any wrist size. Face diameter, 1-5/8". Made in Japan.