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    Re: Longitude by calculator -theodolite
    From: Richard B. Langley
    Date: 2013 Jul 4, 10:54 -0300

    "surveying astronomy is a dead art" -- Not quite, at least not for UNB GGE 
    graduates. I still teach astronomical azimuth determination using sun shots 
    with a theodolite. The Star Almanac for Land Surveyors is still published:
    http://astro.ukho.gov.uk/nao/publicat/sals.html
    
    -- Richard Langley
    
    On Thursday, July 4, 2013,185, at 10:44 AM, G Becker wrote:
    
    > Honestly, surveying astronomy is a dead art. Theodolites were the last link 
    to astronomical observations. Survey equipment suppliers frown on sun shades 
    for Total Stations. They claim the optical sensors can be damaged by the sun. 
    I think it is more of a GPS sales tactic. Now back on subject, 2008 was the 
    last year of a published American surveyor ephemeris ( 
    http://www.rollanet.org/~eksi/Handbook.htm ). Another website �web publishes� 
    a survey ephemeris� accuracy of the ephemeris is unknown. ( 
    http://www.cadastral.com/index.html )
    >  
    >  
    >  
    > -----Original Message-----
    > From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Richard B. Langley
    > Sent: Thursday, July 04, 2013 9:01 AM
    > To: george{at}gwbeckerpls.com
    > Subject: [NavList] Re: Longitude by calculator -theodolite
    >  
    >  Subject: geodesy
    > One who practices it: geodesist
    >  
    > But many professional geodesists don't know how to take or reduce theodolite 
    measurements. ;-) On the other hand, surveying (or geomatics) engineers 
    (should) know how to obtain precise and accurate results from a theodolite 
    (or a total station).
    >  
    > Don't forget, we have a lot of relevant (oldish but still relevant) 
    publications for free download here:
    > http://gge.unb.ca/Pubs/LectureNotes.html
    >  
    > -- Richard Langley
    >  
    > On Thursday, July 4, 2013,185, at 9:42 AM, G Becker wrote:
    >  
    > > Hello:
    > > 
    > > I decided to start this as a new topic. My goal is to see how precisely I 
    can determine my location using my theodolite (read scale to 3 seconds of 
    arc).
    > > 
    > > Thank you.
    > > 
    > > Bruce
    > > 
    > > 
    > > Bruce,
    > > 
    > > This is one of my favorite subjects. Listed below is a good reference 
    which can be downloaded from the NOAA website. The Navlist has a resident 
    Geodist*, so I'll attempt to not comment on this subject.
    > > 
    > > 1.) Manual of Geodetic Astronomy : Determination of Longitude, Latitude, 
    and Azimuth by Albert Hoskinson and J Duerkesen, Special Publication No 237. 
    In the preface of this book, beginning on page IX, it lists the reference 
    material which also can be downloaded from the NOAA website. Most can be 
    found in various Appendixes of the Annual Report of the Coast Survey.
    > > 
    > > 2.) If you want to purchase a book.. The Elements of Astronomy for 
    Surveyors by J B Mackie. This book has been reprinted many times, I have the 
    8th edition (1982). Each chapter has a list of references.
    > > 
    > > 3.) Geodesy by Alexander Clarke. ( 
    http://books.google.com/books?id=ECUJAAAAIAAJ&source=gbs_navlinks_s ) Most 
    "geodesy" books reference this one.
    > > 
    > > 
    > > * I'm not sure if Geodist is the current politically correct term for a person who geodeticals.
    > > ----------------------------------------------------------------
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    > > 
    >  
    > -----------------------------------------------------------------------------
    > | Richard B. Langley                            E-mail: lang{at}unb.ca         |
    > | Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/ |
    > | Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142   |
    > | University of New Brunswick                   Fax:      +1 506 453-4943   |
    > | Fredericton, N.B., Canada  E3B 5A3                                        |
    > |        Fredericton?  Where's that?  See: http://www.fredericton.ca/       |
    > -----------------------------------------------------------------------------
    >  
    > View and reply to this message: http://fer3.com/arc/m2.aspx?i=124569
    > 
    > View and reply to this message: http://fer3.com/arc/m2.aspx?i=124570
    > 
    
    -----------------------------------------------------------------------------
    | Richard B. Langley                            E-mail: lang---.ca         |
    | Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/ |
    | Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142   |
    | University of New Brunswick                   Fax:      +1 506 453-4943   |
    | Fredericton, N.B., Canada  E3B 5A3                                        |
    |        Fredericton?  Where's that?  See: http://www.fredericton.ca/       |
    -----------------------------------------------------------------------------
    
    

       
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