If it stopped at step three then it would have been accurate.
gl
--- On Tue, 1/29/13, Paul Dolkas <paul@dolkas.net> wrote:
From: Paul Dolkas <paul@dolkas.net> Subject: [NavList 22163] Re: Re: Re: Re: Re: Weems article in latest Air&Space Mag To: garylapook@pacbell.net Date: Tuesday, January 29, 2013, 10:02 PM
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---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.
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