Sky Moon Tourbillon

Preparatory steps

Gently pull the winding crown at 4 o’clock out and rotate the hands clockwise until the flyback hand of the date display advances by one day. Then set the hands to 6 a.m. Now, activate the corrector button between 11 and 12 o’clock and repeat until the flyback hand points to 1.

Setting the leap year cycle (subsidiary dial at 12 o’clock) and the month (subsidiary dial at 3 o’clock)

In the program, the line marked “Leap year cycle” gives you the Roman numeral that indicates the year cycle. Leap years are identified with the Roman numeral IV. Activate the corrector button between 3 and 4 o’clock to first set the leap year display and then the month display.

Setting the date (flyback hand)

The date is set with the corrector button between 11 and 12 o’clock. You will note that the date hand and the day of the week display advance simultaneously. The day of the week can be corrected in the next step

Setting the day of the week (subsidiary dial at 9 o’clock)

Activate the corrector button between 6 and 7 o’clock to set the day of the week.

Setting the moon age (subsidiary dial at 6 o’clock)

Use the corrector button between 5 and 6 o’clock to advance the hand until it points to the full moon. In the program, the line marked “Moon age” tells you how many times you have to activate the corrector button to obtain the correct moon age display.

This mechanism is corrected with the second crown at 4 o’clock on the 24-hour dial with the sky chart facing up and the crown on the right-hand side. Turning the crown clockwise corrects the sky chart and sidereal time. Turning it counterclockwise corrects the moon.

Setting the moon and the moon phase

When the moon phase display indicates a full moon, align the moon index with the meridian (S). In the program, the line marked “Moon phase” tells you how many revolutions the moon must perform to obtain the correct moon phase display setting. Advance the moon index by that number of revolutions. In the program, the lines marked “Moon” tells you the number of large and small graduations by which you must advance the moon index. This completes the moon setting procedure.

Setting the sky

Align the sky index with the meridian (S). In the program, the lines marked “Sky” tells you the number of large and small graduations by which you must advance the sky index. This completes the sky setting procedure.