The abacus was an instrument used by Greeks and Romans for arithmetic calculations, preceding the slide-rule and the electronic calculator, and consisted of perforated pebbles sliding on iron bars.
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As of today's date, December 14, 2010, and including the start and end date in the calculation, someone born on April 11, 1960 would be 18509 days old.
360 days
This is an ephemeral question whose answer depends on when the calculation was carried out. Furthermore, it adds no real value.
In a non-leap year, including the start and end dates in the calculation, there are 286 days between the two dates. In a leap year, including the start and end dates in the calculation, there are 287 days between the two dates.
Including the start and end date in the calculation, there are 92 days between the two dates.