NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sight Reduction Calculator for iOS (update)
From: Stan K
Date: 2018 Mar 27, 16:54 -0400
From: Stan K
Date: 2018 Mar 27, 16:54 -0400
Tony,
Being an Android user, I only got involved with Sight Calc since V1.4, after I acquired an old iPad so I could look into other programs that my students asked about. I didn't know that earlier versions of Sight Calc were so buggy.. The only change I know of going from V1.4 to V1.5 (aside from a typo correction in the Info) was whether the value of Z should be unrounded or rounded to one decimal place before being used in the calculation of Zn. Before V1.5, it was the unrounded value; V1.5 uses the rounded value, to comply with the USPS course materials instructions, which then rounds Zn to whole degrees. This only matters if the rounded value is xxx.5. For instance, if Z was N145.54...ºW, if the unrounded value were used Zn would be 360-145.54...=214.46 --> 214º; if the rounded (to one decimal place) value were used Zn would be 360-145.5..=214.5 --> 215º by Power Squadrons rounding rules. Much ado about very little.
I prefer using the unrounded value, but in Celestial Tools I try to please everyone. The unrounded value is used in Sight Reduction, and the rounded value is used in SR Methods.
Stan
-----Original Message-----
From: Tony Oz <NoReply_TonyOz@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Tue, 27 Mar 2018 16:02
Subject: [NavList] Re: Sight Reduction Calculator for iOS (update)
From: Tony Oz <NoReply_TonyOz@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Tue, 27 Mar 2018 16:02
Subject: [NavList] Re: Sight Reduction Calculator for iOS (update)
Hello, Stan.
Initially the app did not show the proper azimuth, it only gave the Z value in the PZX triangle. It was me who asked for the Zn. When the app was updated - there was an error in that new part of code, Zn was correct only in one quadrant. Then, when fixing this issue - the next bug was planted there - the app gave non-sensical output for the all-zeroes input (LHA=Lat=Dec=0°). That one was fixed in the v1.4.
For now - I'm happy with the app.
Warm regards,
Tony
