Wednesday, February 29, 2012

(Almost) once in four years

Today is February 29. I feel compelled to post something on this once every four years occasion. As I searched around, I realized I was actually wrong about this four years thing. I always thought as long as the year is evenly divisible by 4, it’s a leap year. But actually in order to compensate the 365.256363004-day revolution duration (not exactly 365.25), when the year is evenly divisible by 100, it doesn’t count as leap year. What about 2000? There was February 29 that year! Right, there is an exception of this “100 exception”: when the year is evenly divisible by 400, it’s a leap year again. So 1600, 2000, 2400 are leap years, but 1700, 1800, 1900, 2100 are not. (Oh my...)

Some people say leap days should be holidays because our annual salary is based on a 365-day year. If we work 366 days, it’s like working a whole day for free. I think it makes perfect sense.


1 comment:

スー said...

Hey, nice architectural posts. Just randomly found you online while I was google searching Piranesi's planimetric view of Rome. I like your posts. Wondering if we can know each other in person? We have some similarities. I'm also from Guangzhou, B.ARCH in the U.S., currently spending a semester in Rome. If you are interested, contact me at I have a feeling that maybe we know each other already somewhere on internet community. My name is Su. Nice blog again.