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Moon phase.

"Moon phase" is a function to display moon's age or lunar phase on the dial.
The moon's age is the elapsed time since the moment of the last new moon in terms of days. The lunar phase refers to the appearance that the visible part of the moon changes due to revolution of the moon around the earth. The moon's age and the lunar phases are linked, but they don't always match. But the lunar phase and the moon's age are often confused in general.


「ムーンフェイズ」は月齢および月相を文字盤に表示させる機能である。
月齢とは、直前の新月の瞬間からの経過時間を日を単位として表したものである。月相とは、月の公転によって、月の目に見える部分が変化する様子のことである。月齢と月相は連動するが、必ず一致するわけではない。しかし世間一般では月相と月齢はしばしば混同されている。

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