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    Re: Non-navigational Star coordinates
    From: Bill Ritchie
    Date: 2021 Mar 4, 21:58 +0000
    I can offer an 'indirect' solution, Modris.

    1. Use Wikipedia to find the Hipparcos designator  (HIP) of the star.

    2. Enter this HIP designator into https://vizier.u-strasbg.fr/viz-bin/VizieR-3?-source=I/311/hip2 . It is essential to first tick the “Preferences” table (on the left side of screen) boxes for J2000, Ecl J2000 and Decimal. "Submit" will reveal the star's data for that Epoch and Equinox. Note the values of RAJ2000, DecJ2000, pmRA and pmDE.

    3. Paste these values into Astron's Custom Star boxes (on settings page). The Home Page will then show the SHA (or optionally RA), GHA and Dec for any date you choose.

    The Home Page "Sextant Arc" utility may help with your calibration project. It includes corrections for annual aberration and refraction.

    Hope this helps.

    Bill Ritchie
    50N 003W


    On Wed, Mar 3, 2021 at 7:18 PM Modris Fersters <NoReply_Fersters@fer3.com> wrote:

    Hello!

    Maybe someone can help me by recomending good internet sources where to find accurat coordinates of all Stars (not only navigational Stars) on any date. Initially I thought that Stellarium could serve as a good tool for this purpose, but I found that RA (of course: converted to SHA) and declination of the stars differs from those published for example in F. Reed almanac. Difference can reach some tenths of arc minute. And I am sure that Franks almanac can be trusted more than Stellarium.    

    The main purpose why I am interested in  nonnavigational star coordinates is to use any stars for sextant main scale calibrating (not only standart navigational ones). And that is why I need cooridinates with accuracy of 0.1 minute.

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