It is an Indonesian celebration commemorating what Raden Ajeng
Kartini did for women rights.
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Raden Ayu Kartini was born on April 21, 1879.
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Both titles are honorifics used to address noblewomen in Indonesia. "Raden Ajeng" is typically used for noblewomen of Javanese descent, while "Raden Ayu" is more commonly used for noblewomen of Sundanese descent.
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She died on September 17, 1904. She died from unknown
causes.