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Calendrical Calculations, Third Edition by Edward M. Reingold, Nachum Dershowitz

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        Stone astrolabe from India. (Courtesy of Adler Planetarium & Astronomy Museum, Chicago, IL.)

9The Old Hindu Calendars

Scientists with advanced computers have sometimes failed to predict major earthquakes, but ancient Indian astrology does have the tools to roughly foretell the time and sometimes even the exact date and time of an earthquake.

—Murli Manohar Joshi: The Irish Times (August 4, 2003)

9.1 Structure and History

The Hindus have both solar and lunisolar calendars. In the Hindu lunisolar system, as in other lunisolar calendars, months follow the lunar cycle and are synchronized with the solar year by introducing occasional leap ...

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