NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Origin of term "log rising"
From: Joel Silverberg
Date: 2007 Jan 03, 11:02 -0800
From: Joel Silverberg
Date: 2007 Jan 03, 11:02 -0800
I have been working through the tables in the earliest editions of Bowditch and am wondering why the "log rising" tables are called that. They are basically tables of the logarithms of the versed sine of an angle. The table is entered in hour/minutes/seconds rather than degrees/minutes/seconds and the logarithms listed are those of 100000 times the veresed sine (so that the entries in five-place trig tables can be manipulated as whole numbers rather than decimal numbers). But why are they called log-rising tables rather than versed sine tables (or sine-squared tables) ? --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
