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Lunar age
Synodic month
Libration of the
Moon
* Unauthorized reproduction or citation of this watch or this manual is forbidden. In
addition, partial reproduction or citation is forbidden.
This is the time expressed in days that have passed since the new
moon. For example, "lunar age 5" means that 5 days have passed since
the moment of the previous new moon. The lunar age marker on the
24-hour dial pointed with the lunar age pointer on the lunar age dial
indicates the lunar age.
This is the average phase cycle of the moon, which is approximately
29.530589 days.
The phenomenon that the center of the moon surface facing
the observer librates periodically around the average position.
Consequently, about 59 % of the whole moon surface may be observed
from the Earth.
Brief explanation of astronomical terms
47
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