> ----- Original Message ----
> From: Matthew J. Roth <mroth@xxxxxxxxxx>
> To: For users of Fedora <fedora-list@xxxxxxxxxx>
> 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@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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