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    Re: Nautical almanac 1773
    From: Dave Walden
    Date: 2007 May 01, 19:57 -0700

    Below are output from the xephem program.  First for GAT.  The first
    ANTARES is the one I previously cited, 48-18-20.  It turns out the
    data base I had told xephem to use did not correctly handle proper
    motion.  Using the 2002 version of the SKY2000 data base, the second
    Antares, I get 48-18-16 for the GAT result, as does Frank.
    
    For GMT, where I previously quoted, 48-14-59, I now reproduce Frank's
    48-14-56.
    
            Cns RA          HA           GHA          Dec
    Az        Sep
    Sun     Cnc  8:47:22.82  24:00:00.00  24:00:00.00  17:55:15.4
    180:00:00 163:57:17
    Moon    Sgr 19:40:21.51  13:07:01.30  13:07:01.30 -16:38:13.8
    27:05:51   0:00:00
    ANTARES Sco 16:15:34.12  16:31:48.70  16:31:48.70 -25:54:35.9
    90:32:04  48:18:20
    Antares Sco 16:15:34.38  16:31:48.44  16:31:48.44 -25:54:30.9
    90:31:56  48:18:16
    
    Equ: Geo EOD  8/01/1773 13:05:50 BST
    Site: Greenwich, England
    
     Lat:   51:30:00
    Long:    0:00:00
    Elev: 74.7m
    Temp: 10C
    Pres: 1010mB
    
    
            Cns RA          HA           GHA          Dec
    Az        Sep
    Sun     Cnc  8:47:21.88  23:54:10.05  23:54:10.05  17:55:19.1
    177:29:32 163:54:12
    Moon    Sgr 19:40:07.38  13:01:24.55  13:01:24.55 -16:38:42.0
    24:58:00   0:00:00
    ANTARES Sco 16:15:34.12  16:25:57.81  16:25:57.81 -25:54:35.9
    89:23:23  48:14:59
    Antares Sco 16:15:34.38  16:25:57.55  16:25:57.55 -25:54:30.9
    89:23:16  48:14:56
    
    Equ: Geo EOD  8/01/1773 13:00:00 BST
    Site: Greenwich, England
    
     Lat:   51:30:00
    Long:    0:00:00
    Elev: 74.7m
    Temp: 10C
    Pres: 1010mB
    
    Just to check things, I tried 17 May 1781 3hrs (NA says 62-2-49).
    
                      GMT           GAT
    Frank        62-3-48        62-2-18
    
    xephem    62-3-51        62-2-20
    
    
    
    Lunars Almanac for May 17, 1781
    Date and Times are GAT.
        0:00    3:00    6:00    9:00    12:00   15:00   18:00   21:00
    Moon's HP   54.28   54.26   54.23   54.21   54.18   54.17   54.16   54.15
    Geocentric Lunar Distances
    α Aquilae   56° 28' 46"     57° 34' 20"     58° 40' 30"     59° 47' 15"     60° 54'
    32"     62° 2' 18"  63° 10' 33"     64° 19' 15"
    -FER, Centennia Software, June 2004.
    
    
    Lunars Almanac for May 17, 1781
    Date and Times are GMT.
        0:00    3:00    6:00    9:00    12:00   15:00   18:00   21:00
    Moon's HP   54.28   54.26   54.23   54.21   54.18   54.17   54.16   54.15
    Geocentric Lunar Distances
    α Aquilae   56° 30' 13"     57° 35' 48"     58° 41' 59"     59° 48' 44"     60° 56'
    2"  62° 3' 48"  63° 12' 4"  64° 20' 46"
    -FER, Centennia Software, June 2004.
    
    
    
           Cns RA          HA           GHA          Dec         Az
    Sep
    Sun    Tau  3:38:38.30   3:03:58.96   3:03:58.96  19:30:10.4
    245:48:12  63:11:43
    Moon   Aqr 23:42:44.62   6:59:52.63   6:59:52.63  -5:36:06.1
    278:18:44   0:00:00
    Altair Aql 19:40:06.75  11:02:30.51  11:02:30.51   8:18:01.0
    343:42:03  62:03:51
    
    Equ: Geo EOD  5/17/1781 16:00:00 BST
    Site: Greenwich, England
    
     Lat:   51:30:00
    Long:    0:00:00
    Elev: 74.7m
    Temp: 10C
    Pres: 1010mB
           Cns RA          HA           GHA          Dec         Az
    Sep
    Sun    Tau  3:38:37.64   3:00:00.00   3:00:00.00  19:30:08.1
    244:47:18  63:13:31
    Moon   Aqr 23:42:37.63   6:56:00.01   6:56:00.01  -5:37:00.4
    277:31:27   0:00:00
    Altair Aql 19:40:06.75  10:58:30.89  10:58:30.89   8:18:01.0
    342:35:31  62:02:20
    
    Equ: Geo EOD  5/17/1781 15:56:01 BST
    Site: Greenwich, England
    
    
     Now  I see a 2-3 sec  difference again.  Altair has a relavitely high
    proper motion, using different catalogs, I can get down to 62-2-19,
    but not quite to 18.  Can Frank provide his Moon RA and Dec to .01 sec
    and his RA, Dec, PM's for Altair so I can check into the source of the
    difference?
    
    Altair0,f|D|A7,19:50:47.00|543.3,8:52:5.96|385.6,0.93,2000
    Altair1,f|D|A7,19:50:47.00|538.0,8:52:6.00|386.6,0.93,2000
    Altair2,f|D|A7,19:50:47.002|544.5,8:52:6.03|386.0,0.93,2000
    Altair3,f|D|A7,19:50:47.001|543.0,8:52:6.07|387.0,0.93,2000
    Altair4,f|D|A7,19:50:46.999|536.82,8:52:5.96|385.54,0.93,2000
    Altair5,f|D|A7,19:50:46.999|537.60,8:52:5.98|388.00,0.93,2000
    
    
            Cns RA          HA           GHA          Dec
    Az        Sep
    Sun     Tau  3:38:37.64   3:00:00.00   3:00:00.00  19:30:08.1
    244:47:18  63:13:31
    Moon    Aqr 23:42:37.63   6:56:00.01   6:56:00.01  -5:37:00.4
    277:31:27   0:00:00
    Altair0 Aql 19:40:06.75  10:58:30.89  10:58:30.89   8:18:01.0
    342:35:31  62:02:20
    Altair1 Aql 19:40:06.82  10:58:30.81  10:58:30.81   8:18:00.8
    342:35:30  62:02:19
    Altair2 Aql 19:40:06.73  10:58:30.91  10:58:30.91   8:18:01.0
    342:35:31  62:02:21
    Altair3 Aql 19:40:06.75  10:58:30.89  10:58:30.89   8:18:00.8
    342:35:31  62:02:20
    Altair4 Aql 19:40:06.84  10:58:30.80  10:58:30.80   8:18:01.0
    342:35:29  62:02:19
    Altair5 Aql 19:40:06.82  10:58:30.81  10:58:30.81   8:18:00.5
    342:35:29  62:02:19
    
    Equ: Geo EOD  5/17/1781 15:56:01 BST
    Site: Greenwich, England
    
     Lat:   51:30:00
    Long:    0:00:00
    Elev: 74.7m
    Temp: 10C
    Pres: 1010mB
    
    
    
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