NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sight Reduction Tables for Small Boat Navigation by Hewitt Schlereth
From: Hewitt Schlereth
Date: 2013 Dec 24, 21:43 -0800
From: Hewitt Schlereth
Date: 2013 Dec 24, 21:43 -0800
Hi Nial -
No, this is an 'inspection' table like HO 249 and HO 229. There is one opening - Local Hour Angle. Then, on that LHA page you go to the column for Latitude and run your finger down to the Declination row. Where Dec row and Lat column cross, you read Hc and Z.
Actually, I made this table by cutting down HO 229. The Latitude range is Greenland to Cape Horn, in 2-degree steps. Local Hour Angles are also in 2-degree steps. Declinations are given in 1-degree steps, but only through 29 degrees - which covers sun, moon, planets, and 30 of the 57 Navigational stars.
The book is compact - about the size of a normal novel - but lacks the total declination and latitude coverage afforded by 229 - and the convenience of having LHA and Latitude in 1-degree increments. The 2-degree LHA and Longitude entries of my book mean you have to locate your working position (AP) on an EVEN degree of latitude, and choose its longitude so that LHA is also EVEN. So, some of the time, you are going to have a working position a fair distance from your DR.
Thank you for your interest, Nial. I'm intrigued to know how you came across my book. It's been out of print a long time.
Hewitt
I'm interested in these tables. Can anyone tell me if they are entered twice like the Davies or Bayless?
Nial
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