Re: Feb 29, 2000

     The Sun goes around the globe are 365.2422 days. To make it easier 
     Gregorius made 365 for a year. For February, he made 28 days for 
     February, and 29 days for every 4 years to make correction. The 
     average days for 4 years would be (365+365+365+366)/4 = 365.25 days 
     per year. It is not so accurate, isn't it? .
     That is why he made another rule :
     - 365 days for every 100 years, even though it can be divide by 4.
     - 366 days for every 400 years.
     That rule will make a correction of minus 3 days for every 400 years, 
     or -3/400 = -0.0075. With this correction, 1 year become 365.25 - 
     0.0075 = 365.2425
     
     He ignored the different value of 0.0003 days.
     


______________________________ Reply Separator _________________________________
Subject: Feb 29, 2000
Author:  MIDRANGE-L@midrange.com (Joe Teff) at bngtw
Date:    9/29/99 11:25 AM


I thought the leap year rule stated that any year evenly divisible 
by 4 was a leap year unless it was also evenly divisible by 400 
and then it wasn't. That would make 1700, 1800 and 1900 leap 
years, but 2000 wouldn't be. Yet everywhere I look, it shows a
Feb 29th in 2000 (calendars, PIM software, OS/400 date data 
types, etc). I seem remember a thread on this list a while back 
and it was stated that 2000 wasn't a leap year. Can anyone set 
me straight here.
     
Joe Teff
     
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