# NavList:

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

**Re: Constructing A Logarithm Table**

**From:**Hewitt Schlereth

**Date:**2009 Jan 13, 23:28 -0400

Anon's 11.493 could well be closer than my 11.5. I worked with my HP35s calculator and the x^y function key and only checked 30�, 25�, 06', 16', and 45�. So, for instance, I got Pepperday's Log of 28.385 as 11.5 to the -.28385 power times -100 which shifts the decimal and cancels the minus sign. Hewitt On 1/13/09, Peter Foggwrote: > Thanks for this, Hewitt. From another, offlist source (reproduced with > permission) comes this: > > Bayless' Table is based on the following relationship, > 100000*log (1/sin x ) > Pepperday's Table is similar, viz, > 100*log (1/sin s)/log 11.4953 > (which I have derived empirically). > Where x and s are the required angular values of the argument and > all logs are to the base 10. > > > On Tue, Jan 13, 2009 at 12:27 AM, Hewitt Schlereth wrote: > > > > > It looks to me that the "S" Table is a table of logarithms to base > > 11.5 multiplied by minus (-) 100. > > > > Hewitt > > > > > > > > > > > > > On 1/11/09, Piterr11@gmail.com wrote: > > > > > > Does anyone know what mathematical function Michael Pepperday was using > to construct his 'S' tables? They seem to differ from Bayless, which are > based on the Modified HO 211 (Ageton's Tables). > > > > > > > > > > > > > > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To unsubscribe, email NavList-unsubscribe@fer3.com -~----------~----~----~----~------~----~------~--~---