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    A strange set of Venus LoPs.
    From: Tony Oz
    Date: 2020 Apr 6, 02:29 -0700

    Hello!

    Yesterday I took several sights of Venus. My results puzzle me greatly...

    AP: 60°6,6'N 29°56,8'E
    HoE: 3m; Dip corr = -3,0'
    WE: -0h00m35s; fast

    2020-04-05UT16: GHAVenus = 15°24,1'; dGHA = 15°0,1'/hr; DecVenus = 24°34,6'; dDec = 0,6'/hr

    LoP#1
    16:05:05; WT
    -0:00:35; WE
    16:04:30: UT1

    42°00,6'; HS
    -0°00,2'; IE
    -0°03,0'; Dip corr.
    41°57,4': HA
    -0°01,1; Refr. correction (stars and planets)
    41°56,3'; HO
    42°08,5'; HC
    12,2 nm AWAY

    When I got this huge intercept I immediatelly re-checked the IE and WE values, both proved to be as per used in the reduction. I thought it was some sort of HS reading error. I took my next sight.

    LoP#2

    16:22:30; WT
    -0:00:35: WE
    16:21:55; UT2

    40°02,1'; HS
    -0°00,2'; IE
    -0°03,0'; Dip corr.
    39°58,9'; HA
    -0°1,2'; Refr. corr. (stars and planets)
    39°57,7'; HO
    40°10,1'; HC
    12,4 nm AWAY

    At this point I re-confirned my AP coordinates - they were as per used in the reduction.

    I took three more Venus sights - all gave me the same ~12nm-away intercepts.

    Trying to understand what could go wrong - I thought I could misread my digital wrist-watch (Casio), so I attempted to search the UT for which those HS's would give reasonable intercepts. So, if I somehow could misread 16:07:05 as 16:05:05 it would position me closer to my GPS QTH, but the same ~two-minutes offset would need to occur in all five sights: 16:24:30 instead of 16:22:30 etc, unrealistic "explanation", I think.

    What can it be? Some huge blunder on my side? A local scale error on my СНО-Т?

    Thank you in advance for all the comments and hints.

    Warm regards,
    Tony
    60°N 30°E

       
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