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    Re: Neat video about LEM stellar alignment scope
    From: Don Seltzer
    Date: 2016 Jun 9, 11:03 -0400
    Yes, I also think that those are likely typos, but I wanted to copy exactly what was published.

    Don Seltzer

    Sent from my iPad

    On Jun 9, 2016, at 1:38 AM, Brad Morris <NoReply_Morris@fer3.com> wrote:

    Don

    There appear to be typographical errors in that text. 

    The counter reads in degrees to within ±0.02" or ±72 seconds. 
    Shouldn't it read to ±0.02°, not ±0.02"?

    The maximum reading is 359.88 degrees.
    Shouldn't it read to 359.98 degrees?

    Obviously, this takes nothing away from the intent or data of the paragraph.  I just puzzled over it for a moment or two until it made sense. 

    Brad

    On Jun 8, 2016 7:55 PM, "Don Seltzer" <NoReply_Seltzer@fer3.com> wrote:

    On Wed, Jun 8, 2016 at 5:08 AM, Gary LaPook <NoReply_LaPook@fer3.com> wrote:
    I wonder what what level of precision they achieved (needed) for this method of measuring angles to celestial objects.


    It doesn't exactly answer the intent of your question, but I did dig up the following:

    A reticle control enables manual rotation of the reticle for use in lunar surface alignments. A counter on the left side of the unit, provides angular readout of the reticle rotation. The counter reads in degrees to within ±0.02" or ±72 seconds. The maximum reading is 359.88 degrees, then the Counter returns to 0 degrees. Interpolation is possible to within ±0.01 degrees. 


    Don Seltzer

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