phases-of-moon did not include fix for change of julian/gregorian calendar for dates < 15-OCT-1582

[Frank Scherie]

Hello,

trying to figure out lunar phase for 26-APR-1336 gives in emacs using

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C-u M-x phase-o-moon
Year: 1336
Month: April

Thursday, March 22, 1336: New Moon 1:37am (CET)
Wednesday, March 28, 1336: First Quarter Moon 8:55pm (CEST)
Thursday, April 5, 1336: Full Moon 2:54am (CEST)
Friday, April 13, 1336: Last Quarter Moon 5:34am (CEST)
Friday, April 20, 1336: New Moon 12:48pm (CEST)
Friday, April 27, 1336: First Quarter Moon 3:28am (CEST)
Friday, May 4, 1336: Full Moon 5:39pm (CEST)
Saturday, May 12, 1336: Last Quarter Moon 9:22pm (CEST)
Saturday, May 19, 1336: New Moon 8:44pm (CEST)
Saturday, May 26, 1336: First Quarter Moon 11:26am (CEST)
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while NASA 6000 Year lunar phase table gives for 1301-1400

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 Year      New Moon       First Quarter       Full Moon       Last Quarter          ΔT


 1336                                                         Jan  6  15:37      00h07m
        Jan 14  19:52     Jan 22  04:59     Jan 28  22:06     Feb  5  12:21    
        Feb 13  11:35     Feb 20  12:29     Feb 27  10:56     Mar  6  08:49    
        Mar 14  00:31 H   Mar 20  18:50     Mar 28  00:54 n   Apr  5  03:24    
        Apr 12  10:42     Apr 19  01:23     Apr 26  15:39     May  4  19:12    
        May 11  18:39     May 18  09:22     May 26  06:43     Jun  3  07:52    
        Jun 10  01:20     Jun 16  19:41     Jun 24  21:42     Jul  2  17:34    
        Jul  9  07:59     Jul 16  08:49     Jul 24  12:20     Aug  1  00:54    
        Aug  7  15:51     Aug 15  00:48     Aug 23  02:24     Aug 30  06:53    
        Sep  6  01:57 H   Sep 13  19:13     Sep 21  15:36 n   Sep 28  12:50    
        Oct  5  14:54     Oct 13  15:12     Oct 21  03:47     Oct 27  20:09    
        Nov  4  06:44     Nov 12  11:17     Nov 19  15:04     Nov 26  06:02    
        Dec  4  00:54     Dec 12  05:39     Dec 19  01:47     Dec 25  19:01    

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Looks like "phases-of-moon" does not calculate julian/gregorian calendar switch -
i.e. when date is earlier then 15 Oktober 1582 which is first date of
gregorian calendar.

emacs
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Saturday, August 28, 1582: New Moon 7:54am (CEST)
Sunday, September 5, 1582: First Quarter Moon 11:49am (CEST)
Sunday, September 12, 1582: Full Moon 2:20pm (CEST)
Sunday, September 19, 1582: Last Quarter Moon 4:56am (CEST)
Sunday, September 26, 1582: New Moon 11:35pm (CEST)
Tuesday, October 5, 1582: First Quarter Moon 3:27am (CEST)
Monday, October 11, 1582: Full Moon 10:56pm (CEST) 
~~~~~~~~~~~~~~~~~~ before 15-OCT-1582 results WRONG ~~~~~~~~~~
Monday, October 18, 1582: Last Quarter Moon 4:10pm (CEST)
Tuesday, October 26, 1582: New Moon 5:15pm (CEST)
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NASA (1501-1600)
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 Year      New Moon       First Quarter       Full Moon       Last Quarter          ΔT


 1582                     Jan  1  14:59     Jan  8  22:23 p   Jan 17  02:02      00h02m
        Jan 24  08:56     Jan 30  23:59     Feb  7  16:08     Feb 15  20:26    
        Feb 22  19:21     Mar  1  10:47     Mar  9  10:02     Mar 17  11:05    
        Mar 24  04:08     Mar 30  23:42     Apr  8  02:55     Apr 15  21:43    
        Apr 22  12:04     Apr 29  14:31     May  7  18:04     May 15  04:52    
        May 21  20:11     May 29  06:41     Jun  6  07:11 n   Jun 13  09:46    
        Jun 20  05:26 T   Jun 27  23:40     Jul  5  18:18 n   Jul 12  13:59    
        Jul 19  16:32     Jul 27  16:56     Aug  4  03:48     Aug 10  19:10    
        Aug 18  05:53     Aug 26  09:47     Sep  2  12:23     Sep  9  02:51    
        Sep 16  21:34     Sep 25  01:26     Oct  1  20:59     Oct 18  14:05    
        Oct 26  15:15     Nov  3  15:06     Nov 10  06:30     Nov 17  05:17    
        Nov 25  09:57     Dec  3  02:23     Dec  9  17:31 n   Dec 17  00:03    
        Dec 25  04:09 A     

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cheers,
Frank Scherie