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About The Remaining Signs of Past Centuries
The Remaining Signs of Past Centuries ( , also known as Chronology of Ancient Nations or Vestiges of the Past, after the translation published by Eduard Sachau in 1879) by Abū Rayhān al-Bīrūnī is a comparative study of calendars of different cultures and civilizations, interlaced with mathematical, astronomical, and historical information, exploring the customs and religions of different peoples.
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