Dear Marilyn, About Leap Years (Math Chat)
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Frank Morgan, MAA Online  
Your explanation [in Parade Magazine] of September 13, 1998 that we may need to skip a leap year EVERY FEW THOUSAND YEARS because the tropical year (about 365.2422 days) is a bit shorter than the average calendar year (365.2425 days) neglects CHANGES in the length of the day and year, which are more important on this time scale.... Is the year 2000 a leap year? Yes, since 2000 is divisible by four. Nevertheless, this is an excellent question, since the century years 1900 and 2100, although divisible by four, are NOT leap years. Why?...  


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