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This software concerns dates in five different calendars: the Chinese Lunar Calendar, the Vietnamese Lunar Calendar, the Japanese Lunar Calendar, the Gregorian Calendar (a.k.a. the Common Era Calendar) and the Archetypes Calendar. The Asian calendars differ mainly in the degree of longitude used as the prime meridian (a.k.a. the reference longitude): 105° East for Vietnam, 120° East for China and 135° East for Japan (which is the same as that for the Korean Lunar Calendar). The Archetypes Calendar is included because it has an interesting relation to the Chinese Calendar, as explained here.
But, due to lack of interest from the buying public, we no longer publish this software. Please see our other Chinese Calendar program, Chinese Calendrics.
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