NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: NP303 VOL2 covers 0-49 degree declination? vs. PUB/HO 249 VOL2 0-29 deg dec?
From: Hanno Ix
Date: 2012 Nov 14, 19:20 -0800
From: Gary LaPook <garylapook@pacbell.net>
To: NavList@fer3.com
Sent: Sunday, August 12, 2012 10:22 AM
Subject: [NavList] Re: NP303 VOL2 covers 0-49 degree declination? vs. PUB/HO 249 VOL2 0-29 deg dec?
From: Hanno Ix
Date: 2012 Nov 14, 19:20 -0800
Gary:
It appears to me there is a little inconsistency
within your Self-contained etc. which threw me off somewhat.
In the 4th paragraph of the chapter "Modern Bygrave Slide Rule"
you give an example with D=14deg N.
However, you treat that example with D=20deg N.
The result is consistent with this
value.
Perhaps this has been noticed before.
H
From: Gary LaPook <garylapook@pacbell.net>
To: NavList@fer3.com
Sent: Sunday, August 12, 2012 10:22 AM
Subject: [NavList] Re: NP303 VOL2 covers 0-49 degree declination? vs. PUB/HO 249 VOL2 0-29 deg dec?
| I always bring this up when people ask about selecting a sight reduction method. Try the Flat Bygrave slide rule that you can make yourself for about one buck that computes the data to the same level of accuracy as H.O. 249 and does the computation in less than two minutes, less than one minute when you get proficient. Go to my website at: https://sites.google.com/site/fredienoonan/other-flight-navigation-information/modern-bygrave-slide-rule To get compleet instructions on how to make and use one of these. Also look at: https://sites.google.com/site/fredienoonan/other-flight-navigation-information/self-contained-long-term-celestial-navigation-system for a complete system which takes only five sheets of paper plus the two plastic sheets that comprise the Flat Bygrave itself. gl |
