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I just watch an interesting video about Moonphase watch. mmm... but why do I need to know about moonphase anyway, I just can't think of any practice for the moonphase indicator on the watch?

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    $\begingroup$ This has very little to do with astronomy, since information about the phases of the moon can easily be found elsewhere. However, knowing the timing of lunar phases is useful to astronomers, since seeing is best close to new moons. It is also useful to sailors, since it allows them to predict spring and neap tides. $\endgroup$ – Mick Dec 1 '17 at 3:47
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    $\begingroup$ @Mick I would like to offer a small correction, that sky brightness (darkness?) is best close to new moons. Seeing is an atmospheric effect that varies with turbulence, particulates, temperature, humidity and a few other things. And for everyone else, no I am not talking to myself ;-) $\endgroup$ – Mick Dec 1 '17 at 9:09
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    $\begingroup$ Hardly any practical benefit. A marketing gimmick. Astronomers will know the moon phase anyway (or can easily look it up). Also not much use to sailors, who need more details than moon phase. $\endgroup$ – James K Dec 1 '17 at 20:11
  • $\begingroup$ Maybe the purpose of this Moonphase watch is to guess the date of lunar calendar. $\endgroup$ – 123iamking Dec 3 '17 at 3:02

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