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• Astronomical twilight determination feature
Twilight is not good for watching darker celestial bodies. It is better for
watching them when the position of the Sun is in the range of the celestial
sphere below the line of altitude −18° on the transparent dial. However,
a brighter moon is not also good for watching them. Check influence of
moonlight also by using the lunar age display feature (page 25) and the
indication feature of direction and altitude of the Moon (pages 30 - 34).
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