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    Vacation-time Lunars (cont.)
    From: Ed Popko
    Date: 2018 Feb 3, 04:29 -0800

    Below are my Moon-Aldebaran shots taken on January 21, 2018.

    The work setup could not have been better.  The viewing area was quite open, very clear and dark sky. I used the hood of my car as a work table. Propping up my Sansung tablet with Frank's GPS Anti Spoof Pro timer running. It also illuminates my notebook for recording sights. Could lean on the car to steady my arms while taking sights.

    In this series, I used my Astra IIIB sextant with 7x35 scope. It's much lighter than my C&P Horizon and easier to manouver and hold in the odd positions that taking a lunar often requires.

    Date January 21, 2018     Moon-Aldebaran (far limb)

    KP   Lat 28 41.1’N    Lon 082 18.3’W

    Moon waxing, far limbs sighted, viewing conditions perfect

    WE 00”  using GPS Anti Spoof Pro timer (Samsung tablet on hood of car as work table)

    IE=0.75’ (on arc)

    Sextant  Astra IIIB with 7x35 scope, Vernier interpolation to 0.1’ (a Stan Klein trick)

     

                                             Raw                                                    Reed’s           

    Sight No.       GMT          LDs              LD Pre-Cleared   Calculated Error    LD Cleared

           1            23:34:02   74º 17.1’     74º 00.9’                  0.3’                        73º 26.1’

           2            23:36:49   74º 15.7’     73º 59.5’                 -0.1’                        73º 24.3’

           3            23:38:47   74º 15.1’     73º 59.0’                   0.1’                       73º 23.4’

           4            23:40:55   74º 14.4’     73º 58.2’                   0.2’                       73º 22.4’

           5            23:42:59   74º 14.0’     73º 57.8’                   0.5’                        73º 21.7’

           6            23:44:38   74º 12.8’     73º 56.7’                 - 0.1’                        73º 20.2’

     

    LD GMT Time Bracket

                                                   Interpolated      Interpolated GMT

              GMT         Cleared LD      GMT          vs Observation GMT

          23:00:00        73º 43.7’

      1                        73º 26.1’       23:33:31        00:00:31 slow

      2                        73º 24.3’       23:36:57        00:00:08 fast

      3                        73º 23.4’       23:38:40        00:00:07 slow

      4                        73º 22.4’       23:40:34        00:00:21 slow

      5                        73º 21.7’       23:41:54        00:01:05 slow ...... worst case

      6                        73º 20.2’       23:44:46        00:00:08 fast

         24:00:00         73º 12.2’

     

    Popko

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