NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Santa Barbara 2016: Venus sight
From: Stan K
Date: 2016 Dec 13, 21:40 -0500
From: Stan K
Date: 2016 Dec 13, 21:40 -0500
Peter,
That explains what went on in your spreadsheet, but I'd still like to know why the USNO Celestial Navigation Data site seems to always add semi-diameter. Can anyone out there explain this?
BTW, according to my records I downloaded Astron 12/24/15. I suspect if I look through the Navlist archives I'll find that you announced it around that time.
Stan
-----Original Message-----
From: Peter Hakel <NoReply_PeterHakel@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Tue, Dec 13, 2016 8:40 pm
Subject: [NavList] Re: Santa Barbara 2016: Venus sight
Attached File:
From: Peter Hakel <NoReply_PeterHakel@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Tue, Dec 13, 2016 8:40 pm
Subject: [NavList] Re: Santa Barbara 2016: Venus sight
Stan,
Good catch - that was an oversight on my part. The limb selection in cell I31 allows three options (Upper/Lower/Center), and I forgot to change it from the default - the result changes by ~ 0.1’. For the 4-LOP fix I used my original spreadsheets for everything, and there the SD correction for Venus was indeed 0 (see attached), since I observed it the way you said.
For details about the integrated spreadsheet, see this blog post:
https://navigationspreadsheets.wordpress.com/2015/12/24/new-releases-and-updates/
Peter Hakel
Good catch - that was an oversight on my part. The limb selection in cell I31 allows three options (Upper/Lower/Center), and I forgot to change it from the default - the result changes by ~ 0.1’. For the 4-LOP fix I used my original spreadsheets for everything, and there the SD correction for Venus was indeed 0 (see attached), since I observed it the way you said.
For details about the integrated spreadsheet, see this blog post:
https://navigationspreadsheets.wordpress.com/2015/12/24/new-releases-and-updates/
Peter Hakel
Attached File:
