It it now a leap year?

Antonio Olivares olivares14031 at yahoo.com
Sat Aug 11 00:55:16 UTC 2007


> ----- Original Message ----
> From: Matthew J. Roth <mroth at imminc.com>
> To: For users of Fedora <fedora-list at redhat.com>
> Sent: Friday, August 10, 2007 4:02:57 PM
> Subject: Re: It it now a leap year?
> 
> This makes for a good bit of trivia.
> 
> Q. What month has 19 days in it?
> A. September 1752
> 
> # cal 9 1752
>    September 1752
> Su Mo Tu We Th Fr Sa
>        1  2 14 15 16
> 17 18 19 20 21 22 23
> 24 25 26 27 28 29 30
> 
> Matthew Roth
> InterMedia Marketing Solutions
> Software Engineer and Systems Developer
> 
> -- 
>From man cal, 
  This is due to the Gregorian Reformation in 1752 

A single parameter specifies the year (1 - 9999) to be displayed; note
     the year must be fully specified: “cal 89” will not display a calendar
     for 1989.  Two parameters denote the month (1 - 12) and year.  If no
     parameters are specified, the current month’s calendar is displayed.

     A year starts on Jan 1.

     The Gregorian Reformation is assumed to have occurred in 1752 on the 3rd
     of September.  By this time, most countries had recognized the reforma-
     tion (although a few did not recognize it until the early 1900’s.)  Ten
     days following that date were eliminated by the reformation, so the cal-
     endar for that month is a bit unusual.

HISTORY
     A cal command appeared in Version 6 AT&T UNIX.

OTHER VERSIONS
     Several much more elaborate versions of this program exist, with support
     for colors, holidays, birthdays, reminders and appointments, etc. For
     example, try the cal from http://home.sprynet.com/~cbagwell/projects.html
     or GNU gcal.

So now how many days were in that year?

Jan -  31 
Feb - 29 up to there-> 60
Mar - 31 up to there -> 91
April - 30  up to there -> 121
May - 31  up to there -> 152
June - 30  up to there -> 182
July - 31  up to there -> 213
August - 31  up to there -> 244
September - 30 but this one has only 19?  where did the other days go?  up to there -> 263
Oct. - 31  up to there -> 294
Nov. - 30  up to there -> 324
Dec - 31 up to here --> 355

Total Days in that year: 
7(31) + 3(30) +1(29) + 19 = 355 
This was a leap year, a leap year has 366 days, where are the other 11 days.  Ok we lost 11 for September of that year but why?

Is this the only year that has only 355 days?

cal 0 is illegal -->
[olivares at localhost ~]$ cal 0
cal: illegal year value: use 1-9999

Beautiful work Matthew, you have found the exception to the leap year that does not have 366 days?   ~]$ cal 1752
                               1752                                

       January               February                 March        
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
          1  2  3  4                      1    1  2  3  4  5  6  7
 5  6  7  8  9 10 11    2  3  4  5  6  7  8    8  9 10 11 12 13 14
12 13 14 15 16 17 18    9 10 11 12 13 14 15   15 16 17 18 19 20 21
19 20 21 22 23 24 25   16 17 18 19 20 21 22   22 23 24 25 26 27 28
26 27 28 29 30 31      23 24 25 26 27 28 29   29 30 31

        April                   May                   June         
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
          1  2  3  4                   1  2       1  2  3  4  5  6
 5  6  7  8  9 10 11    3  4  5  6  7  8  9    7  8  9 10 11 12 13
12 13 14 15 16 17 18   10 11 12 13 14 15 16   14 15 16 17 18 19 20
19 20 21 22 23 24 25   17 18 19 20 21 22 23   21 22 23 24 25 26 27
26 27 28 29 30         24 25 26 27 28 29 30   28 29 30
                       31
        July                  August                September      
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
          1  2  3  4                      1          1  2 14 15 16
 5  6  7  8  9 10 11    2  3  4  5  6  7  8   17 18 19 20 21 22 23
12 13 14 15 16 17 18    9 10 11 12 13 14 15   24 25 26 27 28 29 30
19 20 21 22 23 24 25   16 17 18 19 20 21 22
26 27 28 29 30 31      23 24 25 26 27 28 29
                       30 31
       October               November               December       
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
 1  2  3  4  5  6  7             1  2  3  4                   1  2
 8  9 10 11 12 13 14    5  6  7  8  9 10 11    3  4  5  6  7  8  9
15 16 17 18 19 20 21   12 13 14 15 16 17 18   10 11 12 13 14 15 16
22 23 24 25 26 27 28   19 20 21 22 23 24 25   17 18 19 20 21 22 23
29 30 31               26 27 28 29 30         24 25 26 27 28 29 30
                                              31

What were the moon phases for that year 1752?

1752 Phases of the Moon
                            Universal Time

        New Moon   First Quarter       Full Moon    Last Quarter    

         d  h  m         d  h  m         d  h  m         d  h  m

                                    Jan  1  8 32    Jan  8  9 19
    Jan 16 15 03    Jan 24  3 33    Jan 30 19 57    Feb  7  5 19
    Feb 15  7 50    Feb 22 12 06    Feb 29  7 59    Mar  8  2 20
    Mar 15 21 43    Mar 22 19 06    Mar 29 21 02    Apr  6 22 11
    Apr 14  8 54    Apr 21  1 33    Apr 28 11 17    May  6 15 19
    May 13 17 55    May 20  8 37    May 28  2 28    Jun  5  5 13
    Jun 12  1 24    Jun 18 17 27    Jun 26 17 53    Jul  4 16 06
    Jul 11  8 11    Jul 18  5 02    Jul 26  8 51    Aug  3  0 31
    Aug  9 15 18    Aug 16 19 47    Aug 24 23 00    Sep  1  7 17
    Sep  7 23 56    Sep 15 13 26    Sep 23 12 19    Sep 30 13 20
    Oct  7 11 13    Oct 15  9 00    Oct 23  0 58    Oct 29 19 53
    Nov  6  1 46    Nov 14  5 07    Nov 21 12 57    Nov 28  4 13
    Dec  5 19 18    Dec 14  0 14    Dec 21  0 13    Dec 27 15 25

source: 
http://aa.usno.navy.mil/cgi-bin/aa_moonphases.pl?year=1752&ZZZ=END

There was no september 7, 1752, no New Moon

The other moon phases existed.  This is intriguing.

Regards,

Antonio 
 





       
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