1 century = 100 years
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There are 100 years in a century, so 10 centuries would be 1000 years.
Fifty centuries equal 500 years. This is because each century consists of 100 years. Therefore, 50 centuries x 100 years/century = 500 years.
Approximately 1,400 years separate the work of Ptolemy, who lived in the 2nd century AD, and Copernicus, who lived in the 16th century.
A Century is 100 years so 8 Centuries is 800 years.
Look for a perpetual calendar on the Net, that should help. You would think there would be 25 but I am not sure they didn't skip a leap year in the year 2000 (which was the final year of the 20th century, not the first of the current one).