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By Dr. Howdy, Ph.D.
A.P.E., N.U.T.
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Thursday
Leap Year History
In 1582 Pope Gregory decreed that October's dates would skip
from the fourth to the fifteenth, dropping ten days. The reason
for this seemingly strange act had to do with the calendar system
that was in use at the time.
Unlike our current system, the old Julian calendar had a leap year
every four years without exception. Because a year is really a fraction
shorter than 365.25 days, tiny errors began to accumulate.
By the time of Pope Gregory's decree, the calendar was adjusted
by ten days compared to Earth's solar year. When he issued his
decree, Gregory also fixed the leap year rule, so that leap years
do not occur on century years (divisible by 100), unless the year
is also divisible by 400. There is one other exception: years divisible
by 4000 are not leap years. For example, 1900 was not a leap year,
but 2000 is one.
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