NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Message:αβγ
Message:abc
 Add Images & Files Posting Code: Name: Email:
Re: Weems article in latest Air&Space Mag
From: Gary LaPook
Date: 2013 Jan 30, 13:46 -0800
If  it stopped at step three then it would have been accurate.

gl

--- On Tue, 1/29/13, Paul Dolkas <paul{at}dolkas.net> wrote:

From: Paul Dolkas <paul{at}dolkas.net>
Subject: [NavList 22163] Re: Re: Re: Re: Re: Weems article in latest Air&Space Mag
To: garylapook---.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 wrote:From: Paul Dolkas Subject: [NavList 22158] Re: Re: Weems article in latest Air&Space MagTo: garylapook---netDate: Tuesday, January 29, 2013, 7:55 PMI 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 WaldenSent: Thursday, January 24, 2013 2:38 PMTo: paul---netSubject: [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.pdfThe Weems watchhttp://www.monochrome.nl/the-history-of-the-pilot-watch-part-four-longines-and-lindbergh/----------------------------------------------------------------NavList message boards and member settings: www.fer3.com/NavListMembers may optionally receive posts by email.To cancel email delivery, send a message to NoMail[at]fer3.com----------------------------------------------------------------View and reply to this message: http://fer3.com/arc/m2.aspx?i=122100View and reply to this message: http://fer3.com/arc/m2.aspx?i=122158

View and reply to this message: http://fer3.com/arc/m2.aspx?i=122159

View and reply to this message: http://fer3.com/arc/m2.aspx?i=122160

View and reply to this message: http://fer3.com/arc/m2.aspx?i=122163

Browse Files

Drop Files

Join NavList

 Name: (please, no nicknames or handles) Email:
 Do you want to receive all group messages by email? Yes No
You can also join by posting. Your first on-topic post automatically makes you a member.

Posting Code

Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
 Email:

Email Settings

 Posting Code:

Custom Index

 Subject: Author: Start date: (yyyymm dd) End date: (yyyymm dd)