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The simplest prototypes of the World Double Calendar - double official state calendars of Israel, the United Arab Emirates, Saudi Arabia etc.: i.e. solar + lunar (lunar-solar) calendars working officially simultaneously. Unfortunately, in the given calendars the 7-day's week based on a Hebrew myth, not reflecting a natural lunar cycle is applied. The World Dual PETIN-METON Calendar is organized in such a manner that the same date of any lunar month always falls on the same day of a week and always coincides with the same Moon phase.