04-20-2017, 12:32 PM
(This post was last modified: 04-20-2017, 12:38 PM by c_davidson.)
Rumata,
I can't exactly answer your question. However, while Polaris is easily found in the sky, Pub. 249 Vol 1 includes the Polaris tables 6 & 7 on page 353 (the last page of tha volume).
The Air Almanac also includes the Polaris tables and can be found here-
Polaris- Correction for (Q) (2017)
I think that version is included on the TheNauticalAlmanac.com since it's the most up to date version though the one found in Pub. 249 Vol. 1 will not yield a significantly different result.
Polaris is typically used just to determine latitude. Using the Polaris Tables 6 & 7 only require LHA ♈ (Aries) and not the additional SHA of Polaris to solve for latitude. Thus, you can determine latitude quickly using Tables 6 & 7 than the lengthy process of using Polaris's SHA and drawing an LOP.
While Polaris is a useful, my guess it's not listed in the Pub. 249 Vol. 1 stars as it's not very bright. But there could be other considerations that I'm not familiar with.
The Nautical Almanacs found on TheNauticalAlmanac.com provide Polaris's SHA & DEC for each year on the daily pages.
You can get the procedure to determine latitude using Polaris here- Determine Latitude using Polaris
Polaris also has the Latin name of a Ursae Minoris
You can also get the principle navigational stars SHA & DEC from the Air Almanac here-
SHA & DEC of stars
Clen
I can't exactly answer your question. However, while Polaris is easily found in the sky, Pub. 249 Vol 1 includes the Polaris tables 6 & 7 on page 353 (the last page of tha volume).
The Air Almanac also includes the Polaris tables and can be found here-
Polaris- Correction for (Q) (2017)
I think that version is included on the TheNauticalAlmanac.com since it's the most up to date version though the one found in Pub. 249 Vol. 1 will not yield a significantly different result.
Polaris is typically used just to determine latitude. Using the Polaris Tables 6 & 7 only require LHA ♈ (Aries) and not the additional SHA of Polaris to solve for latitude. Thus, you can determine latitude quickly using Tables 6 & 7 than the lengthy process of using Polaris's SHA and drawing an LOP.
While Polaris is a useful, my guess it's not listed in the Pub. 249 Vol. 1 stars as it's not very bright. But there could be other considerations that I'm not familiar with.
The Nautical Almanacs found on TheNauticalAlmanac.com provide Polaris's SHA & DEC for each year on the daily pages.
You can get the procedure to determine latitude using Polaris here- Determine Latitude using Polaris
Polaris also has the Latin name of a Ursae Minoris
You can also get the principle navigational stars SHA & DEC from the Air Almanac here-
SHA & DEC of stars
Clen