Windu is a term for an eight -year period . According to the Javanese calendar , which was revised and perfected by Sultan Agung , the king of the Mataram Sultanate , one windu consists of eight years with the year names: Alip, Ehe, Jimawal, Je, Dal, Be, Wawu, and Jimakir. As a comparison, the Chinese and Japanese calendar systems use a twelve-year cycle using animal symbols to characterize the life that might occur in the years in question.

Windu also has a cycle, which consists of four cycles, each named Windu Adi, Kunthara, Sengara, and Sancaya. So, one cycle takes 32 years.

In the overhaul of the Javanese calendar held in 1633 AD (1555 Saka year), Sultan Agung also divided one week ( peken ) into five days: Pahing, Pon, Wage, Kliwon, and Legi. The time interval of one year is divided into twelve months, the same as the calendar system based on the moon in general (similar to that used in the Chinese year system and the Hijrah year ). The length of 1 year in this lunar calendar is less than the Gregorian year (which uses the solar reference). That is, in general, each Saka (Javanese) year will be approximately 10 or 11 days shorter than the Gregorian year.

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