The perpetual calendar
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From: Andrew Usher on 20 Feb 2010 20:05 Prai Jei wrote: > Andrew Usher set the following eddies spiralling through the space-time > continuum: > > > 3. That the leap year rule be changed to have a leap year occur every > > fourth save that it be delayed when the leap year would start on a > > Thursday, and that this gives 7 leap years in every 29, which is near > > enough. > > 7/29 amounts to 0.2413 of an extra day on average. We're looking for 0.2422. > The Gregorian calendar says 97/400 (0.2425) which is more accurate, the > Revised Julian Calendar says 218/900 (0.24222 recurring) [1] which is more > accurate again. 7/29 IS close enough when you consider the slowing of Earth's rotation. However, it's wrong - the leap year procedure I wrote (which is necessary) does not give 7 in 29 years, since that isn't a whole number of weeks. Andrew Usher
From: Andrew Usher on 20 Feb 2010 20:06 Prai Jei wrote: > Andrew Usher set the following eddies spiralling through the space-time > continuum: > > > 3. That the leap year rule be changed to have a leap year occur every > > fourth save that it be delayed when the leap year would start on a > > Thursday, and that this gives 7 leap years in every 29, which is near > > enough. > > 7/29 amounts to 0.2413 of an extra day on average. We're looking for 0.2422. > The Gregorian calendar says 97/400 (0.2425) which is more accurate, the > Revised Julian Calendar says 218/900 (0.24222 recurring) [1] which is more > accurate again. 7/29 IS close enough when you consider the slowing of Earth's rotation. However, it's wrong; the leap year procedure I gave does not give 7 in 29 years, since that is not a whole number of weeks. Andrew Usher
From: Andrew Usher on 20 Feb 2010 20:09 Mike Barnes wrote: > Adam Funk <a24061(a)ducksburg.com>: > >From man 5 crontab: > > > > When specifying day of week, both day 0 and day 7 will be > > considered Sunday. BSD and AT&T seem to disagree about this. > > But they presumably agree that day one is Monday. But 0 is the start of computer indexing - at least in real programs. 0 = Sunday. Andrew Usher
From: R H Draney on 20 Feb 2010 20:22 Androcles filted: > > >Fuckwit "R H Draney" <dadoctah(a)spamcop.net> snipped > in message news:hlp5d002463(a)drn.newsguy.com... > ><gracious courtesy returned> You're in America now...we snip in this country.... We also don't play games with followups....r -- A pessimist sees the glass as half empty. An optometrist asks whether you see the glass more full like this?...or like this?
From: Androcles on 20 Feb 2010 21:15
"R H Draney" <dadoctah(a)spamcop.net> wrote in message news:hlq1t7010ap(a)drn.newsguy.com... > Androcles filted: >> >> >>Fuckwit "R H Draney" <dadoctah(a)spamcop.net> snipped >> in message news:hlp5d002463(a)drn.newsguy.com... >> >><gracious courtesy returned> > > You're in America now...we snip in this country.... > You are in England now, we use commas in written English and play games with follow-ups. Only the parochial Americans and fuckwits hallucinate they are the whole world. |