NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: slide rule sight reduction accuracy
From: Gary LaPook
Date: 2009 Jun 19, 04:05 -0700
From: Gary LaPook
Date: 2009 Jun 19, 04:05 -0700
Paul Hirose wrote: > Regarding the Bygrave simulation, it can be done if I know the rules. > For instance, azimuth is obtained by taking an arctangent, but that > function yields a result between -90 and +90. There must be some rule to > convert that to the range 0 to 360. > > But to do a simulation you do not need to get to the step of converting Az to Zn since the Hc is computed from Az not from Zn. In a simulation, watch out for the special case where Az is greater than 85º since Hc becomes very sensitive to Az in that range and even rounding up or down half a minute can make a significant change in Hc. gl --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---