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Re: Lunars for dummies like me
From: Zorbec Legras
Date: 2004 Sep 24, 14:02 +0000

----- Original Message -----
From: Jim Thompson 
Date:         Fri, 24 Sep 2004 08:30:25 -0300
To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
Subject:      Re: Lunars for dummies like me

>But how did they convert the difference between LAN and LAT to a time for their ship's clock?

In the French Navy they did it this way:

1? Take the local time at apparant sunrise from the ship's clock (Tvge)
2? Compute P for altitude = 0, with cos P = tan lat tan dec.
(table 24 Friocourt)
3? 12 - p = local time Tvg
4? Tvg - Tvge = correction to apply to the ship's clock.

The ship's clock was not used for nautical computations
--
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