# NavList:

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

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Re: LAN sight help !!
From: Pierre Boucher
Date: 1999 Aug 14, 8:44 AM

```Hi Barry,

>      mer pass + DR-LON(W) = GMT of LAN
>
>       12h 06m + 8h 09m 12s = 20h 15m 12s
>
>
>  How does 20h 15m 12s help me in predicting LAN at my long....Is it
>that simple that I just don't see it..???

To compute directly LMT and LAT try:

ZT + DLo = LMT

DLo is + if west of the ZM (zone central meridian)
DLo is - if east of the ZM

LMT � Eqn. of Time = LAT

You could also use the GHA method in pr�dicting the ZT of the merridian passage.

In the daily pages of your almanach, find the closest (smaller) GHA and
substract from your DR longitude and note the time of that GHA
Search the color pages "Increments and Corrections" to find the remaining
degres and minutes and extract their equivalent minutes and seconds.

Exemple for today august 14 1999
Find the ZT of the mer. passage at DR 125d 36.0'W:

DR Lo   125d 36.0'
GHA     -118d 49.9'           20h 00 GMT (from the daily pages)
6d 46.1'                   27 minutes (found in the
colored pages)
20h 27 GMT
- ZD(+8)        8
ZT              12h27

Have fun!

Pierre Boucher
**************************************************************************
X
XX X                                 Pierre Boucher N
XXX XX               formation en navigation de plaisance
XXXXX XXX
XXXXXX XXX          la "VOILE"...  le reste n'est que du vent...
XXXXXXXXXXXXXX       ''Sail, Sail !''... the rest is only wind
XXXXXXXXXXXX
XXXX                      EMAIL: pboucher@lavoile.com
XXX                               "http://www.lavoile.com"
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```
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