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    Re: Longitude by calculator -theodolite
    From: G Becker
    Date: 2013 Jul 4, 09:39 -0400

    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@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:
    -- 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/       |

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