SIDEREAL DISPLAY Celestial Dial covering the internal surface of the inside case, representing the celestial vault through zodiac signs A full rotation in 1 sidereal year1 counter clockwise. Oval sky indication: Showing the portion of the stars visible from the northern hemisphere, a full rotation clockwise in 1 sidereal day2 above the celestial vault. Month indication: 12 months on sides of the celestial dial, indication index at 6 o’clock.