On Apr 6, 9:38 am, "John Nagelson" wrote:
On Apr 6, 6:19 pm, (Eugene Griessel) wrote:



"JohnNagelson" wrote:
On Apr 6, 2:52 am, " wrote:
On Apr 5, 1:48 pm, "JohnNagelson" wrote:

On Apr 4, 5:11 pm, " wrote:

On Apr 4, 2:34 am, "JohnNagelson" wrote:

Hello, the US Nautical Almanac lists 173 "navigational stars", of
which a shorter list of 57 is sometimes extracted.

I've been unable to find these lists online, although I have found
databases referencing many millions of stars!

Could someone tell me if they know where the lists of 57 and 173 stars
exists online.

Or if it doesn't, and someone has got the two lists in text format,
I'd be very grateful if they could post them in follow-up to this
message!

Bowditch's THE AMERICAN PRACTICAL NAVIGATOR in hardcopy, or
online in PDF form at URL:

http://www.irbs.com/bowditch/

A big thank you to everyone who has posted in reply. Bowditch looks a
fantastic
source on celestial navigation, which I will study.

Unless I am mistaken, though, it gives the list of 57 plus Polaris,
not the 173, although it says the latter is given in the US Nautical
Almanac.

Maybe there is a shareware navigation program somewhere that I can
pick out the
info from???

The Nautical Almanac is not available online or in PDF form, but
there's a free (shareware) program with the data that can be printed.

Check these out:

http://www.tecepe.com.br/scripts/AlmanacPagesISAPI.isa
http://www.tecepe.com.br/nav/download.htm
http://www.tecepe.com.br/nav/TheOnlineNauticalAlmanac.htm

Only uses 60 stars unfortunately!

http://aa.usno.navy.mil/data/docs/Nav_Star_Chart.html
http://aa.usno.navy.mil/data/docs/navstarchart.pdf

Already downloaded this and printed it - very nice chart
but shows the 57 with names and numbers, not the 173.

http://asa.usno.navy.mil/SecH/brightstars.html

Download the PDF file for one of the years. In it the names of some
stars are preceeded by a number - 1 to 173 will give you the stars you
want.

Eugene L Griessel

Thank you very much, Eugene.

(I hadn't read the above post before I replied to your other one).

Unfortunately even this doesn't work, though!! I downloaded and
searched for
'150', '159', and '171' (chosen at random), and nothing came up -
so some of the 173 must be missing. Aarghh!

And some of the numbers appear multiple times, like 44.

There doesn't appear to be any online list of the 173. Given that
Bowditch is online (several places) I'm surprised the Nautical
Almanac is not. Since the list is readily available in the Almanac,
buy the almanac from the USGPO.