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Re: Modifications to 2102-D
Date: 2009 Aug 13, 14:15 -0400

```Hi Gary

Yes, that is an approximation that can and does work. Off list, Chief Franklin recommended just the
same thing. I felt that there was enough error to not make me happy.

What I wanted was to have the sextant preset to nearly the correct value.  Doing
so eliminates (at least for me) the lack of certainty as to exactly which star is the right one and
makes it easier to bring the star to the horizon.  I assume the midpoint of twilight for time and go
from there.  The altitudes and azimuths are so close for the 15 minutes (or so at my latitude) as to
not make a difference.

To get the star in the view, yes, I use my Bygrave.  Why?  Because I can and it is fun!  Nothing like
the feel of that instrument in practice.

Best Regards

-----Original Message-----
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of glapook@pacbell.net
Sent: Thursday, August 13, 2009 1:12 PM
To: NavList
Subject: [NavList 9494] Re: Modifications to 2102-D

"I just use my to determine which stars would be practical.  Since my
latitude is 40 north, it places me right between the N35 and the N45
blue templates.  Therefore, the altitudes and azimuths given really
don't do the trick. "

And:
"Once I have the list, I swap over to the Bygrave to calculate the
altitude and azimuth of each.  That way, when I am ready to swing the
arc, I can preset the sextant to the expected altitude and point via
the compass. Generally, the star is right in the telescope! "

A trick you can use to get better accuracy for latitudes between the
template latitudes is to set LHA Aries (either using the almanac
method or my modification or Chief Franklin's modification) and then
take the template off the center pin and slide it north of south until
the zenith is aligned with your DR latitude. This isn't perfect but
will be accurate enough for you to be able to preset your sextant.

gl

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