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    Re: Weems article in latest Air&Space Mag
    From: Paul Dolkas
    Date: 2013 Jan 29, 21:53 -0800

    Gary-

     

    Thanks. I’m trying to recreate exactly how the watch was to be used. In order to get the LHA of the sun, you need to have an accurate watch to do a regular sun shot. Is this what the article was referring to in step 4? I can’t think of any other way to do this.

    The other thing I’m a little confused about, is that you would never reset your watch during a flight, unless you had another one on board. (step 4). I would much rather imagine where the hour/minute/second hands would be for the time you want to convert, and then read off the corresponding degrees/arcmin/arcsec.

     

    -Paul

     

     

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Gary LaPook
    Sent: Tuesday, January 29, 2013 8:51 PM
    To: paul{at}dolkas.net
    Subject: [NavList 22160] Re: Re: Re: Re: Weems article in latest Air&Space Mag

     


    From which you compute the  LHA of the sun which is a measure of local apparent time (LAT.)

    gl

    --- On Tue, 1/29/13, Gary LaPook <garylapook---net> wrote:


    From: Gary LaPook <garylapook---net>
    Subject: [NavList 22159] Re: Re: Re: Weems article in latest Air&Space Mag
    To: garylapook---net
    Date: Tuesday, January 29, 2013, 8:44 PM


    The classic "time sight" preferably with the sun on the prime vertical.

    gl

    --- On Tue, 1/29/13, Paul Dolkas <paul---net> wrote:


    From: Paul Dolkas <paul---net>
    Subject: [NavList 22158] Re: Re: Weems article in latest Air&Space Mag
    To: garylapook---net
    Date: Tuesday, January 29, 2013, 7:55 PM


    I found the article fascinating – I never knew Lindbergh was an inventor! The watch is pretty clever, you gotta admit.*

     

    Which brings up a (rather basic) question: In the instructions for how the watch was used to find one’s longitude, it talks about finding the local time via sextant. I know of two ways to do this: 1) a noon shot (which isn’t all that accurate, and can only be done once a day), and 2) a lunar. Isn’t there a way of finding local time just using a sun shot? The only way I can think of involves a compass to find the sun’s azimuth.

     

    -Paul

     

    *OK, I’m a watch guy.

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Dave Walden
    Sent: Thursday, January 24, 2013 2:38 PM
    To: paul---net
    Subject: [NavList 22100] Re: Weems article in latest Air&Space Mag

     


    The Longines Lindbergh Hour Angle Watch

    www.watchtime.at/archive/wt_2006_06/WT_2006_06_104.pdf

    The Weems watch

    http://www.monochrome.nl/the-history-of-the-pilot-watch-part-four-longines-and-lindbergh/
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